500k is my expectation for this game too. Don't expect much if any advertising for a game they've lost hope in.
Not having split-screen local multiplayer was a huge oversight for this game. The original had it but it would have been even better in this one with 1:1 sword fighting. That alone would have pushed a lot of sales to the more casual consumer.
As is, I'm sure it'll outsell Conduit but not match CoD so 500k seems just about right.