Any word on pricing? The extra 1gb video memory over the Alienware Alpha is nice, and the M.2 slot is especially welcome, especially if the board supports Smart Response (so you could just slap an M.2 SSD in later as a cache and speed up everything), but if it's much more expensive then I'm not sure how well it's likely to do; you'll always pay extra for the small sizes that only a manufacturer can achieve thanks to bespoke components, but there's a limit to how much that can be.
Also, why 4 HDMI ports? I can't imagine there's much of a use case for a home-entertainment system/games console that's running four HDTVs; nice to be able to do sure, but I doubt many will, and anyone that wants that kind of setup would be better off getting a more powerful GPU (with more video memory) to drive it. Can any of them be used as pass-throughs for hooking up other devices into the same setup? Can it deliver separate video and audio (e.g- one to an HDTV, one to an AV Amplifier)?