From Gregg Drinnan's Taking Note:
The Pats have assigned F Michael Sagen, 17, to the Melville Millionaires. Sagen, who has one goal in 17 games, will spend this week with Regina and then join the Millionaires
He still appears on the Pats roster (like it says "for the rest of the week").... Mr. Drinnan is usually right on with any sort of roster move. I would assume that they are waiting for Nils Moser to get healthy before the transaction occurs.