It looks like what you're referring to is the interim plan to rename asm! to llvm_asm! (which will never be stabilized), since it's a very thin wrapper over the current LLVM inline asm support, and then replace asm! with a better implementation.

There is a working group specifically for inline asm, so it will happen eventually... but it's not going to be a quick process--think about how long async/await takes, and inline asm is actually rather close to that in terms of all the issues that come out of it.