For anyone who hasn't heard, I've just read that they have patched in a Thomas in his real LBSC livery, so enjoy giving him a spin until the big reveal a bit later on...
It's not a new engine, but a fun idea I recommend with him and any future cosmetics is if you can have multiple of the same character in different liveries, then you could add this new Thomas to the background of a scene like he's another E2 visiting Sodor.