First Tap, huh? Sounds like Moose's Tooth is getting even better and adventurous.
I have no idea what the yeast strain might be, but you could always ask around the pub. I've done 1 belgian imperial stout before; I used wyeast 3787. It's a good beer, but the yeast didn't come though like I'd hoped it would. It is a very good strain for fermenting down from over 1.100 though.
"I can't believe how many people think Air Lock is pronounced Hydrometer." -BigKahuna
"If you gave me a beer with placenta in it without telling me I would kick you in the nuts." -ODaniel
"We be in a big hurry for dope beer with much alcamahol and flavor, quality, balance, and aroma don't matter. We just wantz to be druck, u know?" -Yooper