We spoke with Jamie the construction manager this week. He told us that they may have to hire temporary laborers to remove yesterday's snow from the slab.
3 loads of structural steel will be arriving on Thursday, along with steel joists and the steel deck (like roof sheeting) sometime in the next week or two. They will start bolting up the structural steel with a particular kind of bolt whose head spins off when it has reached the desired strength. They can do this work in the cold, though it will go more slowly.
They plan to start framing the outside walls with metal studs the week of December 24th. It sounds like they will work through the holiday weeks -- they'll stop by noon on the 24th and start back up on the 26th, have another short day on the 31st and be back on January 2nd.