Our favorite Hunter (although BRK comes close), Mania, has had some help from the Wrath beta, and has now updated the great Petopia with all the new pets seen in Northrend so far. No penguins yet, but there are some great new bears in there, and some awesome wolves (is it just me, or are wolves underrated as pets?). Unfortunately, there are no new families up yet, but Mania says updates are coming, and of course Wrath is still in beta anyway.
She's also got a Beta pet FAQ up, with everything you'd ever want to know about being a Hunter in the beta, from pet talents to "exotic pets" (the real ones, not the ones BRK dreamed up for us).
It's going to be an exciting time to be a Hunter in Northrend. Pet versatility makes Hunters one of the most interesting classes in the game, and it looks like Blizzard is set to open it up wide in the expansion.