Among the updates in Unvanquished Alpha 10 is a new map, updates to other maps / assets, human animation improvements, a VoIP menu, preliminary x32 support, renderer improvements, new scripting features, and various other improvements that have built up over the past month since the last alpha release.
The renderer improvements with this new game release are described as "On the vanilla renderer, we've now fixed lighting on models, so that if you're stuck using it due to hardware limitations, things will look much better for you. In addition, tweaks to VBOs have resulted on performance improvements on the GL3 renderer. Lastly, we now have more robust handling of shader files, with checks being made to see if they are valid before loading. If they're invalid, they'll be recompiled automatically, which should resolve some of the graphic abnormalities that crop up from time to time."
While up to its tenth alpha, Unvanquished is still years from seeing a beta or official release.
More information on Unvanquished Alpha 10 can be learned from Unvanquished.net along with being downloaded for your favorite operating system.