When Chapman left, there wasn't this flurry of modern 'KVIL-type' music out there to play from the Top 40 list. They had to rely heavily on oldies, and some select currents when possible...and it came across like they were aging with their listeners. Now, with Lady Goo-Goo Ga-Ga and John Mayer, and all those God-awful country crossover "artists" (Keith Urban, Rascal Flatts, etc,) KVIL's got a plethora of songs to choose from now...and it apparently pulls in those coveted female 25ish-44ish listeners (most likely ones who are too old now for Kiss-FM, but wouldn't be caught dead listening to KLUV.)
Honestly, it's much the same model from KVIL of the past...heavy on pop Top 40 that leans softer, a few oldies scattered in, and country crossover songs as well (since those were a natural part of the Top 40 of the 70s, long before the term 'narrowcasting' was thought up.)
What's old is new again, I guess.