I am curious, as well.
I would hope for N scale version of their USRA light locomotives, now that MP is out of business and no one is sure what MRC will keep or trash.
I would also hope for additions to the nineteenth century old MDC line. An eight wheeler, a ten wheeler and some non box type freight cars.
I see that someone mentioned some modern stuff, but no link to anything, so I can not be sure if it is only modern stuff.