No, it will not have its own brick & mortar release.  I've heard that there may be a three-pack or gold edition available when all three of the micro expansions are complete, but that's about it.

If you want to play it now, buy it through Impulse (Stardock's direct download/storefront service).

That's actually why they are doing things this way -- micro expansions worth 10$ wouldn't be profitable sold at stores, but make muucha moola sold online, where all the money goes direct to SD / IC.