Just last week, a new legal ID started playing on B98.5
"B98.5FM...WSB-FM and WSB-FM-HD Atlanta".
I don't the callsigns are changing anytime soon, since they are now IDing the HD signal on 98.5 just days after the 750/95.5 simulcast started. (However, they are not IDing WBTS-HD on 95.5).