OS X 10.9 Mavericks preview
 

"This is still early, early days for OS X 10.9, and Mavericks will likely change and shift much more before it's released this fall. It's clearly not going to be the total aesthetic overhaul iOS 7 is, though, and that's okay. It’s a simple, familiar operating system, even less of a change than Mountain Lion, just with nips and tucks and a whole lot fewer sheets of weirdly torn paper. It has its bugs, sure, but it's also corrected a number of bugs that somehow made it into the final version of Mountain Lion, and even at this early stage is impressively stable and fast. It's gotten rid of a lot of the design issues that plagued many Mountain Lion apps (except for Game Center, which is still hideous), in favor of a cleaner, softer look that is far easier on the eyes." Hard to complain, really.

http://osnews.com/story/27147/OS_X_1...ericks_preview