The Zig compiler is also a (clang compatible) C/C++/ObjC compiler, the Zig toolchain comes with C and C++ runtime headers and libraries, C headers (but not C++ or ObjC headers) can be directly imported into Zig code. Don't know how many of those checkboxes Go ticks (I think it can at least import C headers?).

Whether it's going to become a good alternative for Go will depend mainly on the stdlib I think. What's clear is that the Zig stdlib will be much richer than C's or C++'s, but whether it will be a good match for Go's stdlib for backend work remains to be seen.