For those not in the know, Ubuntu is a Linux Operating system that provides an alternative to using a traditional Windows or Macintosh system. For the most part, Ubuntu has been the most aggressive Linux distribution to date (in case you were wondering, there are probably hundreds of distributions and variants of said distributions). They have consistently offered a stable and very usable OS.
Their impending release of Ubuntu 11.04 (named Natty Narwhal) will bring a new user interface to Linux like we have not seen. See, until this point Linux used primarily two environments, Gnome and KDE. As a side note, people have argued over which environment is better much like we argue over Windows vs. OS X, Ford vs. Chevy, and Marvel vs. DC. This writer prefers his KDE, but that is neither here nor there, but it is correct. Wait, where was I? Oh yeah, there is about to be a Game Changer.
The new environment being presented to us by Ubuntu is called Unity. It is probably the most radical design for Linux. Ever. Users have been able to use Unity for awhile, it is only in the next release that we will see it as the default environment.