I believe it's Earl Mann, the same guy who voices a number of other CBS Classic Hits stations including Chicago's K-Hits, Orlando's Sunny FM, KLUV Dallas, and Tampa Bay's Q105. Ironically, Mann became the voice of Q105 after Brian Thomas took over, and now he's becoming the voice of CBS-FM a month and a half after Brian Thomas *left*.
Hearing someone other than Ziggie as the main station voice will take some getting used to, but if they had to make a change, Mann wasn't a bad choice. I just hope they don't mess too much with the jingles.