I haven't heard about this, what's the story here?
After the restructure that resulted in Margaret Clark being let go, Simon & Schuster reorganized all their imprint divisions. Pocket Books has reverted to MMPBs only (ie. the origin of the "pocket" book that could be slipped into a pocket) and ST trade paperback collections are now published under the Gallery Books imprint. But all still published by Simon & Schuster.