Was hoping for Objective C support when I saw it. Would love to get rid of Xcode.
Objective C support? Never going to happen. Swift support? Unlikely, but a stronger possibility thanks to its cross-platform support. I wouldn't hold my breath though.
Objective C is just as open as Swift is I think
Swift is FLOSS, Apache Licensed and built and collaborated on GitHub: https://github.com/apple/swift
Objective C has not had an official open source release, so far as I know.
ETA: Arguing of course how close the gcc/clang implementations of Objective C may or may not be to the Xcode compilers, of course.