Can you submit using a beta x-code version? In the past you couldn't... I've seen lots of apps embracing the dark icons already - I want to do the same but how do you submit your app using a beta x-code?

me too. I know this happens from time to time but it would be nice apple for apple to stick a little "we are working on it" message in there. Hard to explain to the higher ups why they can't see their daily $$$ :)