I don't think they'll do anything with the goalie situation until the off-season.
As for now, I think they'll ride the hot one which for now is Niittymaki. I could even see a platoon at worst but I'd say to be conservative it'll be 60-40 for Niitty but most likely around 75-25 for Niitty. . . as long as he's playing ok.
Disclaimer: This is just my guesstimation.