Ok so your working away and you find yourself needing a Qt application, lets say kOffice, so you start up Apple's X11 then start up KOffice.... why do that first step? why not just start KOffice?? Well in one weeks time you can - YAY! Check out the screenshot.
You can read the full press release here.
I love it when the unix(tm) world gets even more integrated with the mac(tm) world. It gives me a warm fuzzy feeling deep down inside.