Thanks to Mania (creator of the indispensable Petopia), we now have information on the new pet talent trees for Wrath. This excellent information was brought to us by Nimizar, a hunter lucky enough to get into the beta today. Mania hasn't had time to code any talent calculators up, but I'm more than happy to look at the text of this stuff.
Each pet family has access to one of three talent trees, named Tenacity, Cunning, and Ferocity; however, the trees have a large amount of overlap. There are 17 talents per tree, nine of which are shared with the other two trees and eight of which are only found in that tree. The talents are arranged in five tiers. Each tier requires you to put three points into it to move on to the next tier (compare to five for character talents).
The full description of the talents is too lengthy to put here, so I'll just give the highlights. There are some very appealing skills.