Pets still don't copy over (on the other hand, you get a Mini Tyrael to play with Q_Q). If you want to test this stuff out, your best bet is to cage a bunch of your lv25 pets, including a lv1 rare raptor or cat with Devour, and then copy over. My spare Razzashi pup chewed his way to 25 pretty quickly, even with trying to catch stuff along the way.
Objects in general take less time. Decoy and turrets build twice as fast, it seems. That tornado move that everyone hates also seems to process much faster.
Oh, and when a Gilnean Raven's Nevermore procs, it shouts "Nevermore!"
I've only bothered with a few of the boss fights, but as of right now they're pretty straightforward, even with a kinda limited pet selection.