Hi Sergey,
Yes, I was hoping to find time to finish a new iteration of GHC-iOS with the new toolchain in Xcode 5 before it was released but didn't quite make it. I hope to have some time this week.
In the meantime you should be able to grab Xcode 4.6.3 by visiting
developer.apple.com/ios and clicking "Looking for an older version of Xcode?". Xcode 4.6.3 and Xcode 5 should be able to live happily next to one another if you give them different names (that's how I've been navigating this).
Cheers
Luke