Not sure about Sound EM, other than it sounds like they are tired losing money on hospitalists and want to leverage EM reimbursement to cut their losses. Who owns your hospital? Private? Non-profit? Large Company? I've never see an environment as bad as today's is becoming, where consolidations by our own companies are driving administrators to turn contracts over at the perception of better service.
It's becoming so bad that I almost want to begin demanding a non-compete in each of my contracts just to make it impossible for any new group that comes in to be staffed and take me for the ride. We're paying for those locums costs, and our reputations as commodities are paying more than that.
Sorry about your group changing hands but, as long as its done smoothly, and your compensation and hours are fair, I'm sure you'll hardly notice a change. Good luck!