I'm using the beta... first impressions:
I like the new lock screen and swipe up for settings. Everything looks quite android-ish but with brighter colors.
The new Siri screen is neat, it does remind me of something from android, I can't remember exactly what though...
It just feels really android-ish overall, glad I spend most of my time in apps. Messaging looks so blah now, it's like too flat without contrast.
The app switcher thing is cute but really the icons from iOS 6 were fine for me, it's like not I'mg going to read info off a card, I just hit it and go to the app.
The icons look a little more blown up and not as sharp.
The tilt thing seems a little useless.
I don't like how the search screen is gone. I really got used to that.
The panoramas set in the photos app is neat, but I really dislike all the photos on a white background for some reason.
I like the idea of it all but it feels so much like Android, like ICS, with all the thin lines and everything. Though even the beta feels sleek. I guess that little bit of definition and depth of previous versions of iOS just appealed to me. It made the device seem like it had layers if that makes sense, this kind of feels like it's just all on the surface to me.
I'm not sure of the exact name of it but the zoom from app to icon on the home screen was def the feature of some android launcher from years past.
To me, it's much more 'toy-ish' than 'magical'
edit: and one more thing that kind of sucks.. if you have a real picture as a background and not some graphic thing, the app icon text might as well not be there, it's just not big enough to read against a background with hard lines and colors (like a photo..)