new version of osclass does not have any big change, except that mysql 5.7 is now supported
It has
a lot of changes, this version was long awaited for, and it delivered. It fixed some very old, serious issues, and some newly discovered ones, added some new (albeit minor) features here and there, improved performance in some areas [...] it is definitely not a small release as you claim. The version number change speaks for itself.
Now, there are few important issues that are still not fixed in 3.7.0 (e.g. wrong email accounts, mysql index multiplication @ upgrade, those ones are the most serious issues pending resolution), that I personally would like to be solved (proposed solutions already exists), but we'll have to wait a little for the next update.