Considering changes have to roll out to multiple web servers in multiple countries it makes perfect sense that there is a delay between a new toolset and support for that toolset in iTunesConnect. And it isn't just the sites that need updating. The backing databases also have to be updated as do internal policies and sometimes even guidelines.also consider Xcode 5.1.1 was still being displayed as the minimum to submit apps last time I looked.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review
Tags: