The Colts are in some trouble either way. If they win, they probably have to play us. If they lose, they'll probably be playing Denver two weeks in a row. Even if they try to hide everything from the Broncos, that is just asking for trouble. Plenty of bulletin board material for the Broncos (the Colts *know* they can beat them) and it's hard to let a team prep for you two weeks in a row.
I'm hoping the Colts decide to get rid of the Broncos when they have the chance rather than toy with them knowing they can determine their first round opponent. If they plan on winning the Super Bowl, they'll have to have the "we can beat anyone" mentality anyway.