Reddit video of SB tanking changes, post embargo. (youtube)
https://www.youtube.com/watch?v=O9L71uL9P3Q
Paladin:
Some gains in potency of offense and a lot of gains in defensive capacity. This looks like PLDs are being centered in being pure MT again with some more offense.
Dark Knight:
Huh... DRK looks to lose a noticeable defensive capacity, which seems to make him more of a hybrid now. The biggest change it seems is the drastic decrease in ability to maintain MP sustain while tanking.
Warrior:
Yep, self sustain is essentially a thing of the past. However it seems WARs are getting a LOT more offense with Fell Cleave for days abilities to remove pacification.
From the video, looks like tanks are getting more focused. PLDs look to be true MT material now, DRKs are offensive and defensive hybrids, and WARs are now primarily OT.