Hey Swamp Dawg,
I live in MI and occasionally I get to deal with sub zero temps for bowhunting. Just last week as a matter of fact.
Heres some of the things I do to help stay warm. My boots are a couple sizes bigger than the size shoes I wear so I can fit three pairs of socks. I layer my clothing starting with my long johns, a pair of sweat pants and then my scentlok pants and three pairs of socks with some disposable odorless toe warmers shoved into the toe section between the last two pairs of socks. For my upper body I wear the shirt section of my thermal underwear, a sweat shirt and then my scentlok shirt. I have a nice warm parka and bib set that I wear over the top of everything else, along with my scentlok headcover and one of those mad bomber hats over the top of that. I also have a camo muff that belts around my waist and I put one or two disposable odorless handwarmers in that. My gloves I use are just some light felt gloves. They don't really keep my hands warm per say, but I can't release my arrows smoothly with heavy bulky gloves. I just put my hands inside the muff to keep them nice and toasty until I need to get ready to try and make a shot. Best to have your clothes on the loose fitting side so you will be able to move easier. This is the way I hunt when its really cold. If you have to walk along ways to your stand you might want to wait to put your parka on untill you get there. Otherwise you'll sweat your tail off, and thats no good either.
Good luck on your up coming hunt!

The spirit of the woods is like an old good friend