Greiss is actually playing in Sweden.
Stalock just got called up while Niitty is on the IR. I don't expect him to get any starts, but it looks like he is just filling in until Niitty returns after the All Star break.
Although Stalock doesn't quite have the numbers in the AHL this year and he is behind both Niemi and Niitty, he is absolutely the Sharks goalie of the future.
I can see the Sharks holding onto Niemi for the 11-12 season, and eventually releasing Niitty, with Stalock waiting in the wings.