Apple’s current operating system is called Mac OS X Mavericks, also known as 10.9. But, they are working on the next version, code named Mac OS X Yosemite, which is due out this fall, according to Apple’s site.
They have just announced a Beta Program that people can participate in. They are looking for 1 million beta users to help shape the final product or to find problems.
Want to join the Beta Program? I did.