- No modules
Someone hasn't seen the C++17 draft
Last I heard, modules are now in a separate TS that'll be released around the time C++17 is released, but not in C++17 itself. This means we'll be able to start using it in C++17, and it'll be mostly locked in place, but it won't be officially standard until C++20.
If they changed it back to C++17 itself, I'd be delighted, but even if it's still a TS, that's still great news.