Um, that's essentially what they did in NYC + to some extent Chicago. Since they didn't have the newsroom facility built out yet, they went with 2-3 weeks of Hot AC programming with the little "chocolate/fashion radio" nuggets thrown in as filler.
Then when the news product hit the air, it was woefully disorganized in presentation - not just the usual first day technical glitches that would be expected, but mismatched on-air personalities and uneven story selections that went on for several weeks.
I think they've learned from that lesson and will not hit the air until everything's lined up properly. There's plenty of time; no need given the current religious format (as mentioned in previous posts) to do much in the way of stunting and/or interim formats. No sense making a horrible first impression that may blow off potential new listeners forever.