I see that what looks like the finished product has been released on Steam today. It looks quite good from the new trailer, suggesting that the preorder "taster" last year was a bit of a hiccup. I like that you can tweak the loco physics dynamically whilst the loco is running on a test track, that's pretty cool.
My concern, from the videos I've seen, is that the E2 engine seems to be a bit of a hog like the old Trainz engine, but I suppose the only way to find out is to buy it and see. I'll hold off for now but I would interested to read other people's views and experiences of what looks like a promising addition to the train sim world.
Chris