Yes. I recently checked Wikipedia and they have confirmed that AVATAR 2 will include Sam Worthington(Jake), Zoe Saldana(Neytiri), Sigourney Weaver(Grace), Joel David Moore(Norm), Stephen Lang(Colonel Quaritch), and Giovanni Ribisi(Parker Selfridge). Although Grace and Quaritch both died, they want to resurrect Quaritch. As for Grace, James Cameron wants to make Grace return with some sort of sign from Eywa, possibly returning in a tree- such as the destroyed Hometree or Tree of Souls. Mo'at will return, continuing to be portrayed by CCH Pounder. Tsu'tey most likely will not return, and despite protests against this, Trudy will not return.