fully decrypted and crack is no imminent. it's as "easy" and patching the relevant function like Rei described.
so they're probably hoping to keep the current 1.3 out of circulation (since it's the one with any new "major" features) until they can put more obfuscation in.
I could be wrong though.
There's webpage monitoring software that automatically restores old backups of pages if it detects any sort of issue, It sounds to me like its something like that because literally nothing else would make sense.