Your favourite feature didn't made it into 8.0.0? Don't be sad, get it into 8.1.x and use it today as part of the backports module!
Currently the following core features are backported:
Feel free to propose ideas in the issue queue for your favorite Drupal 8.x+1 feature to be backported! (But don't necessarily expect it to happen unless you're prepared to write the code for it.)