In response to the Monsters Inc roller coaster rumors, I was told by a very good friend last June who works for the Mouse (and I actually mean a trustful, close friend - not a bus driver or some other "acquaintance") that he personally saw sections of track for a new coaster style ride out back at HS. He said he is convinced that the Monsters Inc rumors will come to fruition - but if not, that at the minimum there IS something going in at HS with roller coaster style track.
So, while I wouldn't bet the farm on any specific theming for such an attraction (I.E. Monster's Inc), I do truly believe his observations that something new is coming. Of course Monster's Inc 2 does get release tentatively this June. That being said, however, if you look at Disney's opening of attractions based upon Modern Day Movie Titles, you'll see a trend:
Toy Story release date: NOV 1995/Space Ranger Spin (@WDW) opening: OCT 1998 (In case you're wondering, Toy Story 2 wasn't released until NOV 1999)
Bugs Life release date: NOV 1998/Tough To Be a Bug (@WDW) opening: APR 1998
Lilo and Stitch release date: JUN 2002/Stitch's Great Escape (@WDW) opening: NOV 2004
Finding Nemo release date: May 2003/Finding Nemo Sub Voyage (@DL) opening: JUN 2007/The Seas with Nemo & Friends (@WDW) opening: JAN 2007
Cars release date: JUN 2006 & Cars 2 release date: JUN 2011/Cars Land (@DL) opening: JUN 2012
To sum up this data, only once has an attraction ever opened prior to an actual release (Bugs Life was released 7 months AFTER the attraction actually opened in AK. Of the two attractions based upon Disney movies that had wide-release sequels, one opened after the 1st film was released but prior to the sequel being released while the other attraction opened only after both films were released. And furthermore, the average time between an attraction and the films release was: 2.95 years. But if you remove the two outliers (the shortest time and longest time), the average time between film release and attraction opening is: 3.1 years.
Interestingly enough, Monsters, Inc was released November 2001.