Surprisingly, Praying Mantis at Arnies Airsoft Forums posted a copy of the Army Armament catalog that came along with the Army MEU product. It shows in the catalog a snapshot of an M4 SOPMOD strikingly similar to the TM M4 SOPMOD with recoil engine. The shots there show the dustcover revealing the blowback and the the new gearbox with the recoil engine just like what TM has made. Something to look forward to? For confirmation (how? we still don't know) yet as TM has patented this technology.

Hat tip to Praying Mantis on this and the photos he has taken.