There will be a non-steam version, but that's not coming for another week or so. Any version you will be playing tomorrow will be the steam version. Impulse won't carry it until they get the Non-steam version, so don't count on them for at least a week.
Thanks for the info, a week is far less than I had anticipated! Even if it turns out to be two weeks, I'll still be happy to wait for a non-steam (electric?) version.