If it's been reported somewhere, I've missed it. Kyle Cumiskey has been sent back to Lake Erie according to this transaction page. I'd say that's pretty accurate, since Cumiskey played for the Monsters on Sunday (wearing the A, no less).
Not that it's a big deal - with Hannan healthy enoug to play on Saturday, this move was going to happen sooner or later. It just would be nice to have a little official notification (which I'm sure someone will point out to me within the hour).