Musically, there has been little difference between Star and Q for some time. Both stations lean heavily on recurrent/gold material and both are somewhat Hot AC-leaning (although Q100 certainly plays stuff like Kanye and Soulja Boy whereas Star won't even touch that stuff on nights/weekends). Looking at yes.com logs, it doesn't look like anything's changed since the moved to 99.7 and I don't foresee any alterations, especially given the traditionally conservative nature of most Cumulus CHRs.
IMO, Q100 needs to branch out and become more current-based. But I've been saying that for years now. Playing almost the exact music selection as Star does little to differentiate the two, and the hipper imaging and younger morning show on WSTR aren't going to help matters in that regard. Not to mention the fact that Star occasionally pulls out some golds that make you say "whoa, haven't heard that in a while" and crank it up. That's one of the strongest points of their musical selection if you ask me.
Has any of the imaging/presentation changed based on the few hours we've heard of Q programming on 99.7? I'm at school at the moment, but plan to stream once I get home...