He did mention a while ago that he was interested in finally going back and doing a sequel to one of his movies, mentioning "Dumb and Dumber", "Ace Ventura", "The Mask", and "Bruce ALMIGHTY" (which really wouldn't make sense because Bruce fixed his problems, but ALLLLLLLLLLrighty then hahaha).
Of course, I've heard a lot about him doing "Where's Waldo?", but I doubt that would happen any time soon. But hey, ya never know.
I WISH they would either reboot "The Cat In The Hat" in CGI and have him do the voice of The Cat, then followed later by "The Cat In The Hat Comes Back". He's done so well with Dr. Seuss movies and I personally think he suits it better than Mike Myers