I just installed the iPhone SDK 4.0 beta 3, and I just noticed that I can only build applications for iPhone OS 4.0, or 3.2! I am not able to build for 3.1.3 anymore. This is really a problem for me, as I want to update an application of mine in the App Store, but I can't do it, since I don't have the currently available SDK! I also searched in /Developer/Platforms/iPhoneOS.platform/Developer/Library/ and I saw only "iPhoneOS3.2.sdk" and "iPhoneOS4.0.sdk" inside. All the other SDKs are gone. So, will I need to downgrade to submit my updated applications to the App Store for iPhone OS 3.1.3?