A walk designer can be created for any biped. You need a basic walk and as many blend styles are you want to create. I'll do at least a white paper on creating walk designers and probably an actual tutorial. There are several pieces that need to be in the right place for it to work.

The big change for P13 is that each supported figure is kept separate from all the rest of the figures. That was holding back the variety of figures we could support. Mostly because all the figures had to use the same basic walk. Now every supported figure gets own base walk and blends.

Does this mean non-bipedal figures an work. Probably. I haven't had time to actually try but it seems like it would work.

And Talking horses. Well any figure that has the needed speech morphs can have a viseme map created and used in talk designer. So if somebody makes speech morphs for a horse then we can make a horse talk.