I can't see why they would have rejected (If they did) because we aren't near the 1st of February yet.
Apple announced on the 17th December 2013 the below (This can be found https://developer.apple.com/news/?id=12172013a)
tarting February 1, new apps and app updates submitted to the App Store must be built with the latest version of Xcode 5 and must be optimized for iOS 7
It's not like weren't expecting this, but your apps should be fine up to the 1st February for any submissions as long as they don't break any of Apples review guidelines and don't go against the Human Interface guidelines. But after the 1st of February any submissions that you do will require your apps to be iOS 7 optimized and work to the new Human Interface guidelines
Hope this helps.