Personally, I rather like that they're not doing big changes or redesigns on the user facing side. KDE is pretty damn good as it is and I don't need a whole bag of new-and-shiny breaking my workflow.
Again, not all that much user facing, but a lot of under the hood stuff. Reading through the notes, the things that stood out to me: vulkan, direct3d and metal rendering instead of just OpenGL, better HiDPI support including fractional scaling, better concurrency/multi-core support, and bringing the supported development tools up to date.