Avatar wasn't the best film ever (wasn't the worst, either) but unless these sequels hit it out of the park T2/Aliens-style, I really can't wait for them to be done with so he'll finally make that Battle Angel Alita/Gunnm film he's been talking about for years.
Also there's a vicious rumour going around he might be able to claim the Terminator rights back in 2019, hence the mad scramble from the current holders to get three films into cinemas by 2018. I really hope he does claim them back if he can, the last thing the world needs is more Terminator sequels (unless maybe Cameron himself made one and it wiped everything barring T1 and T2 out of existence
)