3.6.10 is going to be released next month, so it's not like there is a lot of time to add any really cool, new features. It's just a basic progression from 3.6.9, that's all.
3.6.10 will be:
- new FS2NetD code with cross-platform support and support for modular tables
- bunch of bugs from 3.6.9 fixed
- a few new things for mods to take advantage of
- minor performance optimizations
- changes to the ships lab to make it more useful
- reduced memory footprint (by about half)
- removal of AVI/MPG movie player code (only MVE and OGG Theora are supported)
- now OpenGL only (D3D is no longer functional)
And yes, that red-alert bug should be fixed. But you can test that for sure as soon as the first RC build gets released in another week or two.