Hopefully they'll do this, or will at least sell the parts so guys can piece together their own. The MkW bolt is huge, and would really let you push the envelope on handloads.
It looks like the initial CMMG 6mm ARC guns are all AR15s, and not built on thier midsized MkW receivers. I think that must be about keeping cost down and being able to sell uppers that are compatible with standard AR lowers.