This has been talked about quite a bit in Megadeth circles, and the guitar is actually gonna be released after January's NAMM show. Dave's prototype of it was at the Nashville show last month. But the production one will be available next year. (So far)
Right now ESP is struggling to meet the production of the new DV8 SE. They can't find enough tops to do the full run of 12 ESP's and 200 LTD's. The 200 LTD's is fine and will be made. But the ESP ones are more likely looking at being limited to 6 or 10 now. They will begin shipping in late September through December.
As for the Axxion shape, I think it's most similar to the Wave BC Rich's, like Tripp from Static X is using. Hopefully, it's a cool guitar for Dave. :-)