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Still no concepts unfortunately (or reflection). Bit disappointed really, I'm far from a guru but to me this seems like another 'tick' upgrade where c++11 was a

• bonzini 10y ago
  Eight years passed between C++03 and C++11, so I think it's okay to have nine years before the next big release---but with two iterations of polishing in between. The coroutines, ranges and concepts TSs alone are making C++20 pretty interesting, and some of the features will be available in compilers before 2020.
• wrsh07 10y ago
  If you don't think of it as building a specific version and more just as a snapshot of what is currently 100% ready-to-go, you'll maybe feel differently. They did much of the work needed to get modules, concepts, ranges, reflection, parallelism, etc ready to go, but this snapshot doesn't include them. Nonetheless, many of those features will be finished soon and may be available by compilers before c++20