The overnight cities have been announced:
It looks like they're rolling through central Iowa, which is my stomping grounds. I grew up in Ames, currently live about 30 minutes from Tama/Toleda, and my wife is from the Corallville/Iowa City/North Liberty area.
FYI, Ames is a college town (lots of beer and good food).
Between Tama/Toledo and the Amana Colonies (old German/Amish community) is one of Iowa's scenic byways which you will hopefully get to ride. old German/Amish community means more good wine, beer and food. North Liberty is now basically a northern suburb of Iowa City, another larger college town. And the Coralville Reservoir, just north of town, has some great mtn biking trails called "Sugarbottom" if anyone is interested.
Anyway, if you have questions about this area, don't be shy.