Daniel defense makes great barrels, lpk,and bcgs. Their receivers and handguards are not really anything special or "better" in any way.
With that said, looking more at this video, it does look like DPMS GI pattern receivers, doesn't have the slanted radius at the back like Armalite, LaRue, KAC. But it's still hard to tell.
What i don't get, is why the OP just drops a video, then does not return to answer any questions. This type of marketing technique is just annoying, and kinda ride to your potential customers. Id rather not hear anything at all until the final product is ready.
The upper receiver/handguard looks to be proprietary to each other. If it'll fit any other lower, that's all speculation until we see rifles in the wild.
Adding yet another proprietary system to the 308 market. It's sad, i would've hoped Daniel Defense would see the benefit of the AR10/SR25/OBR/LMT style rifles. If you're going large frame, why not go with the guy's who make the best rifles?
The "military standard" is SR25/LMT. Why go against that? Simply to be able to use dpms receivers? Why does the 308 AR market continue to regress?
Maybe I'm just thinking too much.....