After the new Doom, Quake Champions is coming and it will become a new Quake III Arena as I saw it.
Totally awesome!
I hope it will have Radiant level editing support and not just that "snapmap" function!

Hopefully this means it will also use md3 support, because I would LOVE to see those players in Quake III!

No, it won't. It won't be ready for your illegal unethical repackings of copyrighted material.

Edited 1.37 minutes after the original posting.

One thing I guarantee is mods. I mean mods made by the actual developers, but they might add support for fan created mods.

Edited 7 seconds after the original posting.