Actually Disney and James Cameron have collaborated in the past- first with Ghosts of the Abyss - an IMAX 3D documentary that revisited the Titanic site in 2003 and Aliens of the Deep - another IMAX...
The Avatar additions to AK should come sometime in 2015 (just in time between the 2nd and 3rd films in the trilogy)- with a reason why doing something with Avatar now being attractive is that...
It didn't take Harry Potter to realize that franchises like this have value- it is just that Avatar represents more global value than Harry Potter ever could (remember, this announcement pertains to...