I have the new engine mount plates, they look a lot like the ones that came on the standard V2 with the exception the engine mount holes are slotted so you can fit all 4 mounting screws for the larger 2814 series motors and they don't show any milling marks which leads me to believe they're molded rather than milled from a solid chunk. My AD-6 HL has been already been upgraded to much of the V3 spec back when I did the conversion from standard to heavy lift a couple months ago, I have the new engine mount plates and landing gear setup, the rest of it is mostly cosmetic and some of those changes I did with hardware I had on hand. The dome I have is custom made in the USA so no need for the newer one from D/W.
If you bought a heavy lift frame and have the black engine mount plates with slots for the screws and no visible tool marks on them, you have the new engine mounts.
Ken