I'm currently paying the $100/month to have access to the Apple dev features and downloaded this the minute it was put on. I really like the look, customizability but there are tons of bugs (obviously). Once they're all fixed, it should be pretty darn cool. Still not sure if its really enough to keep me on an iPhone, seeing how badass the Galaxy S4 is!
You don't have to be a developer to get the beta, I just downloaded the SDK and installed it with iTunes and it works great! Incredibly stable for a beta. When the full version is released i'll just restore back and install. Instructions on how to do this are here. http://www.reddit.com/r/iphone/comments/1g329l/how_i_installed_ios_7_beta_without_udid_developer/
Oh boy, a new Siri.... If they don't have Samuel L. Jackson answering everything in his Pulp Fiction or Snakes on a Plane persona, I'm going to be very disappointed. Multi-tasking - Is there an easier way to shut the apps off? Like a setting for every app that allows "kill when closed" so that I'm not having to go manually shutting every god damn app off that my nieces/nephews run. No wonder everyone complains about battery life - Nothing I see addresses the power hungry aspects, and in fact makes it all worse.