I've been playing with Zig. I realize it is not at all ready for big companies, big projects, but it is a lot easier for me than Rust. I am learning SPARK 2014 for my needs instead of Rust. Rust has gained a lot of traction over the past year.
I know that is superficial, but although Rust has many great features it looks too much like C++ for me. All those :: and template<likes> are making it look too busy for me. Also type inference looks a bit too powerful - it may make things easier to write, but harder to read.
Personally I cheer for Zig and think that it has the biggest potential to really become a C replacement for me. Other then that I hope that Myrddin [0] will see stable development till 1.0 and beyond. Myrddin has my vote, because it uses QBE [1] compiler backend instead of LLVM. Now that I think about it it would be cool to see Zig on QBE. I just don't think that the current LLVM monoculture is healthy in a long run.
Maybe I'm weird, but I would like to imagine a language like Zig compiled also to DEX for Android and CIL for Windows. Then it could have mostly free platform-native calls. So one could really write truly first-class cross-platform apps.