Fliers at House Show says rematch for World Heavyweight Championship after WM 23

Just a quick note:

Fliers were laying out at the merchandise tables for the Smackdown/ECW show after WM23 which takes place in Fort Wayne, IN. It announces that there will be a WrestleMania rematch for the World Heavyweight Championship: Batista vs Undertaker. I would assume/hope that this would be a dark main event and not on TV since you would have just paid for WM to see the same thing.

PWInsider.com

It could be on TV though, why waste a vignette like this as a dark match.