I gave MK3 some extra time since we added MK trilogy some time ago. MK3 can be added some time soon. Don't know about soundtracks...
Also, we will add Capcom Hits Volume 1 although it is emulator since it is official PC release, but unfortunately it is protected for a long time. Check
here.
You can submit SSF2 - new challengers if you want. It is protected till 2012 (
here).