Will RP be included in Unleashed when it comes out? I'm guessing no because of the worldgen issues.
Redpower will be added to a modpack when it gets released yes, most likely the unleashed pack I'd say[DOUBLEPOST=1374298464][/DOUBLEPOST]
I hope this need will arise before any 1.6 packs, because it would be nice to have some RP alternatives in the pack if RP itself doesn't make it.
Most of Redpower's functionality has been put into 1.5.2 by various different mods, I too would like to see them added. I doubt Redpower will have a 1.5.2 release tho, since 1.6.2 is already out and all