Honestly, I think all signs really do point to the original idea. I think we'd have heard of many more firings today had they really been planning to go soft rock at 100.5. I mean, why only specifically fire Fram, Jenners, and Steve? If you're firing the morning show, why not just say that you're firing the morning show? The guys not mentioned as being fired (Andrews, Owens, Sebas) would fit perfectly with an RG morning show.
Plus, the whole Steve/Vikki thing couldn't happen until the summer. Keep the staff they have, let it go dude-rock for six months, then blow it up in the summer if it doesn't work.
Naturally, Cumulus could just be holding the firing announcements until after the transition is finished.