Try using FaceTime. It doesn't work as well. Most of the screen is black and the video window doesn't take up all screen.
In Mail.app the keyboard stays in portrait mode, even if you hold the device in landscape mode.
The AppStore many times doesn't display search results.
Of course all these things are normal in beta software. You can use it daily (as I do also), but only if you are prepared to accept any issues that might occur.
Did you go into Settings and turn off the Split Keyboard? I don't know why it came enabled.
Yes there is a problem with searching in the App Store.