updated 02:10 pm EST, Thu February 13, 2014
Difficulties not reflected on official system status page
A number of App Store developers are encountering iTunes Connect outages when trying to submit new or updated apps, complaints suggest. In some instances people have been unable to connect for almost 24 hours, and the problem appears to be affecting developers around the world. Despite this, Apple's official system status page for developers shows no signs of trouble.
Apple has yet to respond to inquiries, but will probably restore service as soon as possible, given the importance of the App Store to developers, customers, and its own bottom line.