Attention: This post has been edited since it was originally posted, where it now includes some AvA UI, the Sheogorath Costume icon, a few mount icons which have been featured in past data mines but still haven't been implemented, and more Crafting Materials.
Some of these icons and items are from the most recent updates as well as some older icons mixed in there. Note that data mining isn't illegal or against the Terms Of Service, but not all data is final, nor is it guaranteed to be implemented. Data mining promotes insight and discussion amongst customers, which may prove valuable to developers before the final products are released.
AvA | PvPArtifacts
artifact_001

artifact_002

artifact_003

artifact_004

artifact_005

artifact_006

artifact_007

[Comment: Unsure what these could be for... They could be objectives in Cyrodiil, or perhaps they're artifacts that can be awarded at the end of campaigns, considering that Volendrung, Spellbreaker, and Blackwater Blade are seen here and there are campaigns sharing the same name, so maybe end-of-campaign awards depending on the campaign you're in?]
Compass UI
ava_flagaldmeri

ava_flagdaggerfall

ava_flagebonheart

ava_flagneutral

ava_flagbase_aldmeri

ava_flagbase_daggerfall

ava_flagbase_ebonheart

ava_flagbase_neutral

ava_flagcarrier_aldmeri

ava_flagcarrier_daggerfall

ava_flagcarrier_ebonheart

ava_flagcarrier_neutral

ava_murderball_aldmeri

ava_murderball_daggerfall

ava_murderball_ebonheart

ava_murderball_neutral

ava_returnpoint_aldmeri

ava_returnpoint_daggerfall

ava_returnpoint_ebonheart

ava_returnpoint_neutral

ava_town_aldmeri

ava_town_daggerfall

ava_town_ebonheart

ava_town_neutral
Currencies
currency_001

currency_002

[Comment: Similarly to Tel Var Stones, these look like new PvP currencies.]
Siege Ammo
siege_ammo_001

siege_ammo_002

siege_ammo_003

siege_ammo_004

siege_ammo_005

siege_ammo_006

siege_ammo_007
Siege Hookpoints
siege_hookpoint_001

siege_hookpoint_002

siege_hookpoint_003

siege_hookpoint_004

siege_hookpoint_005
Siege Weapons
siege_weapon_006

[Comment: Note this is *different* to the battering ram that is currently used in PvP, and so, seems to be a new siege weapon.]
Consumables - Dye Packs
potion_022_type_001

potion_023_type_001

potion_024_type_001

potion_025_type_001

potion_026_type_001

potion_027_type_001

potion_028_type_001
Costumes
bosmerfemale_high_01

bretonhero_01

bretonmale_high

bretonmale_low

bretonmale_med

darmathrastealth_01

domathrabattlearmor_01

imperialfemale_high_01

jomathraspellcaster_01

monkeyshines

[Comment: I double-checked if that monkey was in the Costumes category, and it definitely is, so I don't know if this is a ZOS mistake or if we could actually be getting a monkey costume.]
sheogorath_01
CraftingBeast
ragged_hide

ragged_pelt

ragged_skin
Chitinous
cracked_carapace

flimsy_carapace

sturdy_carapace
Cloth
bark

base_echaterwool_r1

base_echaterwool_r2

base_echaterwool_r3

petals

pods

pollen

roots

sap

seeds

serrated_leaves

stamen

stems
Critter
fish_fin

fish_scales

fish_tail

flying_insect_bug_abdomen

flying_insect_bug_thorax

flying_insect_bug_wings

fowl_beak

fowl_feet

fowl_wattle

insect_antenna

insect_legs

insect_stinger

rodent_ears

rodent_whiskers

snake_eyes

snake_tail

snake_tongue

vertebrate_cold_blood

vertebrate_small_heart

wild_animal_claws

wild_animal_paws

wild_animal_teeth
Enchantment
base_amber_r2

base_amber_r3
Flowers
raw_famin

redwort_flower_r1

saints_hair
Gems
carnelian

ceyabel

cyclops_bone

daedra_skull

hrotanda

lipsand

moranda

ninwand

porphyry

varla

welkynd
Ingots
moonstone
Leather
alkahest

ambergris

antimony

base_horkerskin_r3

bile

blood

cinnibar

gall

litharge

nitre

phlegm

spirit_of_hartshorn

vitriol
Metals
graphite

phosphorus

quicksilver

tin
Mushrooms
asco_cap_r1

entoloma_cap_r1
Ores
base_dragonbone_r2

base_dragonbone_r3

base_orichrome_r1

base_orichrome_r2

base_orichrome_r3

moonstone

jasper

lazurite
Poisonmaking
reagent_centipede_legs

reagent_moon_sugar

reagent_mudcrab_chitin

reagent_scorpion_stinger

reagent_scuttle

reagent_snake_venom_***

reagent_troll_fat

reagent_wasp_stinger

reptile_viscera
Potion
base_oil_5_r3

base_water_1_r3

base_water_5_r3
Style
item_draugr_r1

item_draugr_r2

item_ragada_r1

item_ragada_r2
Wood
base_bristlecone_r3

gum

shellac
Professions
These are what I was talking about earlier... Not sure what they could be for, but I've attached screenshots of the groups of items:
Forrester:

Outfitter:

Runecrafter:

Smith:
Crown Store
bounty_expunger_high

bounty_expunger_low

bounty_expunger_medium

poison_001

poison_002

poison_003

poison_004

poison_005

all_dlc
Entitlements
001

002

003

004
Gear
[Comment: The gear here is gear that has not already been featured on the list that
@Dominoid put together, which can be viewed here:
LINK]
Ancient Yokudan
[Comment: Note this is *different* to the Yokudan motif.]
1hhammer_a

1hsword_a

2haxe_a

2hhammer_a

2hsword_a

12haxe_a

bow_a

dagger_a

heavy_chest_a

heavy_feet_a

heavy_hands_a

heavy_head_a

heavy_legs_a

heavy_shoulders_a

heavy_waist_a

light_feet_a

light_head_a

light_legs_a

light_robe_a

light_shirt_a

light_shoulders_a

light_waist_a

medium_chest_a

medium_feet_a

medium_hands_a

medium_head_a

medium_legs_a

medium_shoulders_a

medium_waist_a

shield_a

staff_a
Dromathra
heavy_chest_a

heavy_feet_a

heavy_hand_a

heavy_head_a

heavy_legs_a

heavy_shoulders_a

heavy_waist_a

light_feet_a

light_hand_a

light_head_a

light_legs_a

light_robe_a

light_shirt_a

light_shoulders_a

light_waist_a

medium_chest_a

medium_feet_a

medium_hand_a

medium_head_a

medium_legs_a

medium_shoulders_a

medium_waist_a
Minotaur
1haxe_a

1hhammer_a

1hsword_a

2haxe_a

2hhammer_a

2hsword_a

bow_a

dagger_a

heavy_chest_a

heavy_feet_a

heavy_hands_a

heavy_head_a

heavy_legs_a

heavy_shoulders_a

heavy_waist_a

light_feet_a

light_hands_a

light_head_a

light_legs_a

light_robe_a

light_shirt_a

light_shoulders_a

light_waist_a

medium_chest_a

medium_feet_a

medium_hands_a

medium_head_a

medium_legs_a

medium_shoulders_a

medium_waist_a

shield_a

staff_a
Order of the Hourglass
1haxe_a

1hhammer_a

1hsword_a

2haxe_a

2hhammer_a

2hsword_a

bow_a

dagger_a

heavy_chest_a

heavy_feet_a

heavy_hands_a

heavy_head_a

heavy_legs_a

heavy_shoulders_a

heavy_waist_a

light_feet_a

light_hands_a

light_head_a

light_legs_a

light_robe_a

light_shirt_a

light_shoulders_a

light_waist_a

medium_chest_a

medium_feet_a

medium_hands_a

medium_head_a

medium_legs_a

medium_shoulders_a

medium_waist_a

shield_a

staff_a
Gifts
box_001

box_002

box_003
'magechamber' -- Spellcrafting?
icon

icon_02
Mounts
bear_d

camel_b

senche_e

wolf_b

wolf_c

wolf_d

skeletalbear_a

skeletalguar_a

skeletalhorse_a

skeletalsenche_a

wildhuntguar_a

wildhunthorse_a

wildhuntsenche_a

wildhuntbear_a
Personalities
maniac_01
Pets
062

063

065

066

067
POI
poi_horserace_complete

poi_horserace_incomplete
Tokens
appearancechange

characterslot

namechange

racechange