well, there is rumors they (not ubisoft though) is working on monkey island 5. but i would not count on anything til you can actually see the game box in a shop. not even the "preorder" means anything that they would be close to be done.

oh and by the way, i liked myst too. but the navigation in legacy of time (not exactly an sequal to myst, is it?) is a it - well - strange. hopefully myst IV will be easy to navigate. or was riven myst 2 ???