I'm quietly hoping they keep the feral tree like it is. I like being able to tank, dps, or heal interchangeably as needed, it makes filling groups that much faster. Granted that isn't really a problem with 5man anymore but being able to fill any hole in a raid will be excellent. Some people might say "that's what alts are for, duh" but I can't get tanking bracers for my bear if I switch to a priest now can I? :P
I don't think we'll be left as the perma-OT-*****, the only reason that was the case in BC is because we could still be crushed. The high health and armor was supposed to compensate for that but it really didn't, so the shield tanks were still the preferred choices for anything boss level. That doesn't happen anymore so it should be pretty interchangeable.