Probably non. But anything can happen in the next 12 months or so.
While MSTS2 & KRS are not out yet theirs really nothing from stoping people from whiping out gmax, 3ds max, 3D canvas, eg and having a crack at building your favorite loco. A few people over at UK train sim have been modeling stuff for KRS for months. Some of us should probably take the gap between now & the release to sproose up what models we already made &/or start on something new.
While most of us have worked with MSTS & Trainz, we still don't know the do's & don't of up-comming train sims. While both MSTS2/KRS probably allow more polygons for highly detailed models, but it's how each sim will handle textures & privot points that are probably going to be the worry. And we can asume that physics & controsl are also going to be handled differently in each sim. But it's possible to change texture options to suite the sim/s in questions. We just have to wait until we got the sims/SDKs in hand.
Until we see MSTS2 & KRS: we wait, we plan, we build..