Time for the resident Michigan's Adventure person to step in.
You got the coasters for those two years right. Here's what CF has done for MiA in the rides area since they purchased it:
2002 - Skycoaster, Dodgems, HydroBlaster (dry waterslide), Be-Bop Blvd (car ride), Go Karts
2003 - Nothing (major infrastructure and landscaping, though)
2004 - Swan Boats
2005 - Funnel of Fear
2006 - Grand Rapids
And I'm not saying Michigan's Adventure is getting X-Flight, believe me. I honestly am not even close to a guess on where it's going, but to add fuel to the rumors when I drove by the park the other day I saw lots of heavy equipment back by Grand Rapids as well as what appeared to be footers... no clue if they are or not, but just something to keep in the back of your head.