Its a long way off tFK, but in essence it is proposed to divide airspace into areas of "Known Traffic" (Class K) and Unknown (U).
The implications for separation adn control in class K are clearly somewhat different to Class U. Much more than that varies somewhat depending on where you read it. The bottom line is
- fewer airspace classes
- greater harmonisation of ATC service
- less confusion.
Worth holding you breath for perhaps
2D