if you give me some more specifics of what you are interested I will fill you in. I would say it's 95% Maya work. Houdini is used sometimes I believe, but rarely.I know Weta uses/used Maya for at least some of their work. It would be interesting to know what the rest of the pipeline looks like.
prosthetics suck.I still think it looks a lot like a video game. I also still don't understand why it was all done in 3d. It seems to me that they could have done the main characters (the blue guys) with prosthetics.
Not strictly trueWeta most times only hires from within new zeland, they do hire outside if your really really good.