I asked on the A-main Hobbies thread on here when they thought they would have the kit, and gere was the response...

Hello kevmtnbiker,

We should receive the Ultima SC6 within two weeks. I just spoke to Kyosho and it looks like the middle of the month. And, we should get them a few days after that.

Thanks for shopping with us. Please pre-order one so you can make sure you get one of the first kits.

Regards,
Jason