There is no binary yet on phonegap.com, but it will be there when it's ready (it's in progress as we speak). If you want the source for iOS, you can grab it here: https://github.com/apache/incubator-cordova-ios/tags
phonegap.com - where Adobe releases binary+src versions of Apache Cordova
Apache jira - where Apache Cordova issues are tracked, and where contributors and devs can send bugs
github - where Apache Cordova source is mirrored, and where contributors can send code patches
Eventually Apache will also release Cordova source on Apache infrastructure itself, this is in progress.