Happy May Day,
I've revised the packaging guidelines, partially in response to comments Spot made a couple months ago, and partly in response to comments everyone here has left. It's not done by far, and probably needs more TLC. cabal-rpm doesn't actually spit out working spec files right now, but it's close enough that we can focus on the guidelines now more than focusing on cabal-rpm.
I want to open up the current state to comments, before I ask Spot to have the Packaging Committee come in and make their comments. I'll probably end up doing that in about a week.
In its current state, I doubt they'll accept it anyways, but just give their feedback as to what needs to be changed. If you don't have the time to comment now, don't worry, there'll be plenty of time.
http://fedoraproject.org/wiki/PackagingDrafts/Haskell
Cheers, Yaakov