Well, with some luck and work, there will be some interesting improvements and variety to mounts, to be sure.
One of the new rules I've written that I really like is that mounts explode when "unhorsed"; this gets rid of battlefield clutter, massively improves CPU use... and it's a lot more like the actual Middle Ages (one did not grab some random horse on the battlefield; they were trained for their owners and trying to grab a stranger's horse was a bit like grabbing a stranger's attack dog, only it weighs 1000+ lbs., lol).
There are a bunch of new rules planned or built; for example, the player can jump a lot better / longer, allowing them to traverse terrain they might not have been able to before. I'm going to test whether it's possible to make jetbikes also ignore terrain slopes to a much-greater extent, so that they're really quite mobile.
I just tested the new model in-game for the first time, and yeah, it's pretty cool.
@DtheHun: There will be a lot more visual variety, eventually. I had to get the initial concept worked out, though, and the only concept drawing I could be bothered to make looked like a Flash Gordon-esque arrow with a seat, lol.