Yeah, I took 5.2 down. There were really no "improvements" in it. There were a couple of skinning changes, but nothing big. The change log I posted when I had the beta up only had like 4 things in it. It was for all intents and purposes a 5.1 ROM which is why I decided to take it down.
At the time, I was just itching to release something, but I've never been one to release a new version just for the sake of releasing a new version and that's what that was. I also didn't feel it was as good as v5.1. You're not missing anything, don't worry.