My app is in status of "waiting for review". But I find a bug, and want to submit a new binary. Unfortunately, I can't find the reject button. It seems like a bug of itunesconnect in new UI.
I have tried these solutions:
1. logout and login.
2. clear safari history.
3. upload a new version binary.
I spent hours for this problem. I ensure that there is not only me!
http://stackoverflow.com/questions/32941125/itunes-connect-cannot-reject-binary