Yes the rumors are true. I was roped into writing a rating module for Gallery v2. My "project page" can be found here, it's mostly just my notes as I was developing. I'll turn it into a more formal resource for potential users once it's done and merged into the gallery CVS. The code is currently in its second round of code review.
I have to give thanks to Bharat Mediratta (bharat), Alan Harder (mindless), and Andy Staudacher (valiant) for helping me dive in head-first into Gallery2 module development. Also congratulations on a very impressive application framework. I'd definitely look forward to doing more in that environment when time allows.