It has a form (missing a submit button) and then an "OR, sign up with Facebook".
EDIT: I see what you mean now, no I didn't put up a hosted link since I just developed the one screen during a 5 min break. That's a decent idea though, maybe I'll make a full demo application (maybe I'll make it a Todo list, no one has ever used that for a demo app before) and put it up on Heroku.
In terms of some concrete attributes which I like, I think it probably is the best framework I've seen in terms of the general aesthetic. I have high hopes that it will allow me to create most of the view elements I'd need to prototype in an incredibly short period of time. I haven't used jQuery mobile for some time now (> 1 year) yet it seems like there are more CSS classes in Ratchet that mimic the iOS look and feel well enough that one could develop a full iOS app prototype in a day or less. If I remember correctly from using jQuery mobile, there was a bit more code to write, and the general look just didn't feel as good to me.