I emailed Ashdown a couple days before NAMM with the same Q and had a response in a day, but it was a "Lemme get back to you on that..." response which is to say, no response at all.
I just heard back from Mark G. He said they will be in stock at SweetWater soon, but didn’t give an exact date.
As a side note: I may look for a used V4B RI as an option as well.