OS X Mavericks release date, which was first said to be on October 15, is now rumored to be on October 22, according to a report by All Things D. According to sources familiar with Apple’s plans, who spoke to All Things D, the Cupertino tech giant will hold an invitation-only event on the said date to unveil the OS X Mavericks, new Mac Pro, and the new line of iPads.

Consistent with the latest news about the OS X Mavericks, 9to5 Mac earlier reported that Apple has begun training its staff about the OS. Members of Apple Care will be required to learn about the operating system’s new features, installation process and troubleshooting options for six hours at the least. The training is expected to over the course of the next few weeks.

9to5 Mac said that the training is similar in secrecy and style with the iOS 7 and iTunes Radio training. It will also not be held for all Apple Care staff, but will be done in small batches to avoid information disclosed during training from leaking.

The Mac's newest operating system was announced last June at the company’s World Wide Developer Conference (WWDC) and is now on its eight developers’ preview, the new operating system is now undergoing tweaks and testings for a final release.

New features for the upcoming OS X include a new Mapps app, tabbed finder, iBooks, and an overhauled look at the calendar. Safari, the flagship browser for the Mac and iCloud Keychain is also in the new version with notable updates.

The price of updating to the OS X Mavericks has yet to be identified but in a June article by PC Mag, the most recent update, being the Mountain Lion costs $19.99 at the time of release, the update prior to Mountain Lion, Lion costs $29.99. The tech publication noted that it’s hard to imagine Apple charging more for the OS X Mavericks operating system considering the price of new updates has gone down over the years.