In just a few hours, Steve Jobs will start this years keynote at the Apple Worldwide Developers Conference (WWDC) 2011, and as usual it is expected that he will reveal new and exciting things.

First of all, we are waiting for the next version of Mac OS X Lion. According to Apple, they have selected the best features from the iPad, and they bring it over to the Mac with OS X Lion. Among these features we find the Launchpad, which will be your home for different apps and full-screen apps for a better experience with the programs.

Some things are not so easy to hide, and a huge $1 billion data center in North Carolina is definately one of those things.

According to a Data Center Knowledge report published in October 2010, the data center is “fully operational,” with Apple beginning to “ramp up production” at the server farm. The North Carolina data center is already five times larger than the company’s current data center in Newark, California.

iCloud is expected to provide cloud streaming of music, which will give users access to their music library from any Internet-connected device like the iPhone or iPad. Last week, Apple confirmed the service, and said that iCloud will be presented by Steve Jobs today.

To follow the event live, you could check out Engadget, who are broadcasting live from WWDC 2011.