I'm personally hoping that the additional ability for all classes brings a bit of freshness to the experience. I think Titans are going to get *way* more mileage out of the deployable shield than many are thinking right now -- it's the only ability right now I can think of that not only has a chance of counter-playing supers, but also power ammo. A big plus in PvP especially.
The universal dodge for Hunters is interesting, but it's certainly more of a "hop" than the annoying dodge roll of shadestep; the side-effect of refilling ammo or melee energy is a nice addition, but you know, Titans seem to get their weapons reloaded too when dropping a shield, so that balances out the class choice. It will get a lot of usage in PvP, though.
Warlocks getting the big PvE buffs of the game sort of rubs me the wrong way, though. That is something I think should have stayed with the Defender class, a class I'm not super happy to see go the way of the dodo. In PvP this ability is also going to be *super* powerful, though Titans can counterplay it with a shield I guess, the ability to give your entire team a buff when team shots are looking more and more important feels like it's going to get *a Lot* of abuse.
I wish so much we had more details on the Arcstrider. Bladedancer was my favorite class for things like Blink and Skip grenades as well as the quickdraw perk, so I'm hoping those things make it back with a bit of a spin in the Arcstrider class. We'll see, I'm doubting it though; D2 seems to want to walk back on a lot of abiltiies that have to do with agility.