Relax, it's just Ubuntu 15.04. AARGH! IT'S FULL OF SYSTEMD!!!
Most users will notice very little overall difference in this latest Ubuntu release, but it’s this change that packs the biggest punch.
There are a couple of new things that make 15.04 worth the upgrade from previous versions, but the really big changes – like the move to Unity 8 and the whole "convergence" of the desktop and mobile versions – remain in the future.
In the online Ubuntu summit on Monday, Mark Shuttleworth announced that the 15.10 release of Ubuntu, due out in October, will be codenamed Wily Werewolf. Other names that I liked were Wooley Wammoth and Wicked Wabbit. The 15.10 release will see more work on convergence ready for the LTS release next year.