That's what I would do if I was in your position. You're first post didn't mention if you were going to frame it yourself or not so I'm going to assume that you will sub that out. I'd want to do the footings, foundation walls, and slab if possible now to be ready to start framing as soon as weather permits in spring. That gives you the winter to save some money and get competitive bids from local contractors for any work being subbed out. It's been my experience that the sooner you are ready to commit to a trade in the spring, the better pricing is when they have an open schedule.
Couple of things to be concerned about:
1. Frost heave is a b!tch. Talk to local concrete contractors, structural/civil engineers, building department, etc. about protecting your foundation through the winter (blankets and straw are two things that come to mind).
2. If you pour the slab now, make sure you include any plumbing, drains, or stubs for utilities. You don't want to start ripping out new concrete in 7 or 8 months just because you're in a hurry now.
3. Protect all of the anchor bolts - bolt down temporary blocks of 2x4s if you have to to keep them from getting bent over or the threads mangled. The other [more expensive and time consuming] option is to drill and epoxy the anchor bolts into the foundation next spring when framing starts. This allows for walk door (and maybe overhead door) locations to change depending on foundation design.
4. Check to make sure that your permit (if you have to have one) will allow for that long of a construction schedule. Some permits expire and have to be renewed every 6 or 12 months depending on the municipality.
Just a couple of things to think of while you're planning.