Today at WWDC from a keynote speech, Tim Cook announces the next major release of OS X called OS X Mavericks. The naming is based on the Calafornia's most extreme surfing places.
The next major release will offer better battery life, more improvements to Safari and some more power user features and some improvements to Finder.
You can find out about the new release at the official website. Apple are planned to release Mavericks this Fall.
http://www.apple.com/osx/preview/