It'd be cool if you could go catch mounts. Or, like, just hop on some strange wild animal, get bucked off, and stomped to death... I liked in SWG, how you could milk wild animals. I thought it was a little goofy, but once I found out you could do it, I spent upwards of two hours running around milking strange animals.
Anyway, I do hope that there will be some variety in mounts. If there's just horses, I won't even bother getting one... You should totally come up with a bunch of original animals for mounts. It'd be sweet as hell.