I have to go looking for the article, but Aja is working on another project right now. I think it is either supernatural or sci-fi I forget which. It would have been nice for him to come back, but conflicts with what Aja wants to do first and what the studio wants probably is the cause.
Yea Aja is working on a film "Into the Mirror".. So far it is being descirbed as being in the vein of The Ring. Originally they had recruited a newcomer as the director but than Aja stepped in and took over the film..