Open source racing game SuperTuxKart [Official Site] has release 0.9.3 RC1 they're calling the 'Halloween Update'. Sounds like progress is going well!
To get this out of the way first, networking support is not yet in. They're still working on it and they've said it's "well underway", so hopefully we will see online racing in a future release. They could use help too, see how to get involved here.
As for what's included in this new release, they've included three new tracks, a bunch of physics bugs have been fixed, karts now have exhaust smoke, 'HSV colorization' has been added to some of the scenery and plenty more.
A nice little graphical feature, is that headlights will now automatically turn on during night time. It's a small change, but it does help the overall feel of the game!
Here's the trailer for the new release:
You can read their update post here.