Considering Brad's still tied up in Demigod-land, I'll attempt to answer some of these for him (expanding on what Landisaurus said):
1. No. BoogieBac will.
2. I believe around 10. That doesn't include temporary or outside contractors.
3. Lots of ways. Read the dev journals. Some topics I can think of: a sophisticated economy system, created for modding, allowing for player-created content and sharing, sophisticated multiplayer including epic online games and an AI that can join in multiplayer game with stats, multiple open Betas, etc.
4. Stardock created, stardock published
5. Lots of things. See the dev journals.
Only 1 month to go before Beta 0!