You can now set up metadata for your Game Center Achievements and Leaderboard Categories in iTunes Connect. Setting up these elements will allow you to test the full capabilities of Game Center for your app in the sandbox environment. Read the Manage Game Center section of the iTunes Connect Developer Guide for more information.
You can now remove any unwanted applications from your view in iTunes Connect using App Delete. There are important factors to consider when using App Delete — for example, if you want to re-use your SKU or App Name — so be sure to read the App Delete section of the iTunes Connect Developer Guide for more information.
All binary submissions to iTunes Connect must now be uploaded using Application Loader either through Xcode’s built-in App Submission process, or directly using the Application Loader software. This offers a significantly improved experience over uploading through iTunes Connect, including faster uploading, a more stable connection, and early validation warnings. Make sure the status of your app in iTunes Connect is Waiting for Upload before you submit your binary. Read the Distributing Applications section of the iOS Development Guide for more information about preparing your app for submission to iTunes Connect. Registered Apple Developers can also download and watch these session videos from WWDC 2010 to learn more about using Application Loader for binary submission: App Publishing with iTunes Connect Mastering Xcode for iPhone OS Development, Part I