Source; yoinked from MMOClass Development Status
I'd say that at this point in time, the trees that are farthest along are mage, rogue, shaman and warrior. Paladin would be close except that things have changed so much that we still have to move talents around quite a bit.
Also yoinked from MMOHunter Redesign?
No, hunters are not undergoing any kind of massive redesign. We have spent our efforts lately on trying to make sure focus works as intended in both aspects and at low and high level. We're not there yet. We'll work on the talent trees a little more when we feel like focus is where we want it to be, since that will affect the talent design.
It's nice to see some blue acknowledgement on the subject.
We've got a LONG road ahead of us.