2. Lots of fixes for the i915g driver. That's the gallium driver for very old Intel devices - i.e. the driver that's still part of Mesa using a more modern infrastructure. The old driver got removed a while ago while this replacement was in a pretty rough shape. Now you should be able to run Gnome on 20y(?) old HW again :P
I mainly like this one because it shows so nicely how some caring person can keep old HW running in an evolving environment.
2/3