Originally Posted by Daft
Essentially that's it, yeah.
The E92/E93 3 series and M3 LCI happened at that time, and they bumped the model year (as they typically do) to reflect the significance of the change. Rather than let the coupe/convertible model year get out of sync with the sedan/touring, they just changed everything over. So all E9x M3 and 3 series changed to a new model year at that time, even though E90/E91 M3 and 3 series (like you have, OP) didn't really receive any significant revisions (I think there were some minor iDrive enhancements or something though).