I don't see a UI refresh. Apple does not change the UI drastically without purpose. When OS X came out they changed it from Platinum to Aqua because it was a whole new world. But then they kept it mostly the same over the years only changing things gradually as time went on. Remove some pinstripes, turn off opacity, add opacity and blurring there, change the color slightly, refinements in small increments. They won't change iOS a lot like Android did with 4.0. They will change things slightly in time as it progresses. As it should be. Don't change what still works fine. There's nothing wrong with how iOS looks. At all. So stop complaining about it.
I hope Siri is made even better. And it better be a software update and not a new hardware requirement just for the hell of it. It's all software anyway and mostly done on offsite servers. So I don't see that. I look forward to seeing if they give more access to developers. I want Siri to be as tightly integrated with iOS as Spotlight is with iOS and OS X. Also, I want Siri in OS X but that's another story, but it makes sense. At least to replace the aging "Voice recognition" the OS has had since the 9.x days. (Or was it 8.x?) I want to either be able to hold a key for a few seconds, or just speak a word and then tell my computer what to do. And I want developer access as well so third party apps can work with it. This would especially be awesome since I have a Mac mini server that's always on anyway. But I digress...
I too wish we could set default apps. OS X lets us. What if OS X prevented me from setting Chrome as default? Or made me always use TextEdit instead of TextWrangler? I hate that iOS always opens Safari when I click links in other apps instead of iCab. Or better yet, iOS Chrome if and when that comes out.
I don't care about Widgets. But I would like more of them in a specific place. Namely where they already are. In the Notifications area. Though I think it gets pretty cluttered in there, I'd still like third parties to be able to access that area. I mean, if I use a weather app or stocks app or something other than Apple's own versions, they should be allowed to put their own widget in there.
I'd also like a quick settings for WiFi, BlueTooth and GPS and other things to be toggled without having to launch Settings.
One small thing I would like is the ability to save wallpapers to the wallpaper folder rather than camera roll! I hate having my camera roll full of random papers.
DITTO! I HATE that they end up showing up in iPhoto's "Photo Stream". I think there should be a separate "Wallpaper" folder and maybe an option like OS X to change the wallpaper at random each hour, day, or screen wake up. Maybe have a way to choose which screen (Lock screen vs. Home screen) shows which ones. I also wish the Home Screen wallpaper scrolled slightly like Android's did. in that if it's a wide image, it will pan from left to right as you change pages. Giving it more of a 3D feel I guess.