here is my review about Titanium kitchen sink app in new iOS 7 BETA and iOS6. Almost every thing works fine. but in few places UI is not really good. because Apple change the design concept. Please check with below images, comparing iOS6 and iOS7. I hope you can find which is iOS 7(right side) image. All below reviews/images are my own personal opinions. Here I used Titanium demo app.
See the Nav bar and tab bar colors changed
Buttons there is no border or background color in iOS7
Ok Guess which is iOS7 in below screens
Check with Segmented control in iOS 6 and iOS7
It seems we need to redesign some parts and not only titanium apps, native apps also need the same. Here you can download all images I captured image.zip
I am facing few images when I am running this app in iOS7. crashed in few places, Slider > Basic, Slider Change Min/Max — Slider is not moving.. Image view pages also. Background is white, in few pages images and loading indicators are not visible. Here i am not going to say anything about Titanium SDk. because OS level there is a big change now in UI. We can soon expect another Titanium SDK update from Appc. And iOS 7 is still in Beta.