From StarWars.com:
It was announced during a presentation at the first-ever D23 Expo convention in Anaheim, California, that the 20+ year old "Star Tours" attraction will close next Fall, and will reopen the next year with an all new ride and 3-D footage featuring worlds and elements from the prequels.

Here's a video clip posted by forum member Wheeljack35:


See also:
"Star Tours"' 20th Anniversary
"Star Tours" Overhaul In The Works