Maintenance for the week of December 22:
• NA megaservers for maintenance – December 22, 4:00AM EST (9:00 UTC) - 8:00AM EST (13:00 UTC)
• EU megaservers for maintenance – December 22, 4:00AM EST (9:00 UTC) - 8:00AM EST (13:00 UTC)
Mostly just charged melee / bow abilties. For example if you try and use Poison Arrow from Sneak, you will notice it does not count as a sneak attack, whereas Snipe does. Medium and Heavy attacks also work from Sneak, as do skills like Ambush (nightblade), Uppercut (2h), Flying Blade (dual wield), and a few others. You will just have to test things out. Staves don't work nor do spells like Crystal Shards (sorc, I could only imagine the tears...).
There are magicka based abilities that do crit from sneak such as Teleport Strike (base line NB).