Weaver wagon tops and troop cars have already rolled out in Atlas boxes. I'm sure there have been others. The Bradley coaches were offered up at one point too. Theyve done something with it. Maybe not all of it, but its not like they buried it all.
As for PS3, it would be stupid not to. ERR makes available like 5 generic sound files. By licensing PS3, they get access to hundreds of more accurate files, files with variation, and the potential for upgrades or improvements to the system done by whoever is taking over DCS. Why would you not do that? They'd be smart to dump TMCC at this point, as the limited options are far outclassed and the system is essentially dead technology. A license to use the DCS environment is a first, and is a massive upgrade over a TMCC sound file that is basically "Generic GE" or "Generic Alco", etc... noise.
Not to mention, PS3 has DCC onboard. As much as I am not a fan of using PS3 as a DCC decoder, the factory can continue to deal with a single wiring harness, regardless of whether its 2 rail or 3, which probably means the continued ability to sell these things with a 2 rail option. I'm here for it. Since the wheels are interchangable, they can continue to offer the 2 rail locomotives with PS3 so that the 3RS people who are buying them dont have to worry about the engine being DCC only, such as if they put ESU Loksound in it.
Ding, ding, winner. With PS3 Atlas can reduce production costs. Now there will be one wiring harness and board set for both 3 rail and 2 rail that will operate with a major 3 rail control system (DCS) and a 2 rail control system (DCC).