(at the time of posting this, the site is overloaded and unavailable)
Shaft + magical girls + original again, perhaps? I almost hope it's not mahou shoujo just so people don't incessantly compare it to Madoka, but it definitely does look like one. And I'm sure I'll love it no matter what. Also loving what looks like it *must* be Kantoku designs.
Edit: Kantoku designs confirmed.