Do you speak American?

Could some kind soul explain what popular idiom I'm failing to understand here?
"As exciting as the new version of Visio is, the new version of Project is also a very exciting release. I was trying to – I asked Mike backstage, c'mon, between us chickens, tell me, so to speak, is this a breadbasket or a refrigerator or is it something in between, bigger than a breadbasket, smaller than a refrigerator. Mike says this is a sub zero, this is the biggest set of innovations we've done in Project in a long, long, long time."
Steve Ballmer