Just tested it on PTS.
Prepare to Die ALOT!
New Meta is definitely going be templar healing tanks with high magicka for self heals while dropping block. Healers should be excited they're going to be more than busy keeping the tank up in any remotely challenging content.

Or Vamp tanks misting every few seconds with a least one vamp ability to get the undeath passives.

You try to block one wrecking blow to not get stunned and killed and all your stamina is wiped out from all the light attacks everyone else is beating you with at the same time.

Forget using stamina for anything other than blocking and dodging.

Whatever you do don't dodge roll after the first time on accident the extra cost of one is killer.

Stamina is too precious now.

Tell your dps to get their running shoes on they're gonna need them.

Goodbye master sword I will no longer be able to afford you and say hello to a Magicka taunt.

Expect any spare moment you have to be heavy attacking.

ZOS this is not fun, I like the way my tank is now.

Used to think having a game where active blocking was fun. Now I think I prefer having it as a chance to block so I don't feel so stupid having to eat all these hits just so I can afford to block or dodge the ones I think might kill me.

Nirn gear is laughable now. Expect to dump all your CP into Spell resist to just get you back to 2/3 of what you had before PTS.

Disappointment: Working as Intended

Not saying it can't be done, except it's just no longer fun. It was more fun being able to do other things besides micro managing my stamina when I could actually afford to cast caltrops. Now its block enemy heavy attack, heal, heal, heal, heavy attack, heavy attack, heavy attack, block, heal, heal, heal, BORING!

Playing a tank now feels like being in a sinking boat trying to bail water faster than your sinking or in other words recovering stamina fast enough to block that heavy attack that's going to end you. I don't even want to think about tanking Axes now. *CRINGE*