- Boost filesystem
- execution policy: parallel algorithm support for range-based for loops - potential for easily parallelsing existing code
- structured bindings
- spaceship operator
- range based for loops with initialiser
- bit header
- ranges and views - a nod to strongly typed, const languages like Haskell
See the compiler support matrix.
- modules - wait for clang12, gcc11
Look interesting but not available until clang-12.