After the final released of Mac OS X Mavericks 10.9 Final version now Apple has started its traditional beta series through latest and upcoming OS X 10.9.1 Mavericks Beta Update. Apple has a habit to develop and release several number of beta builds like it did in pasts, so OS X 10.9 Mavericks users can expect more beta versions from Apple in upcoming months such as OS X Mavericks 10.9.2, 10.9.3, 10.9.4 etc.
So today Apple has seed and releases first OS X 10.9.1 Mavericks Beta (Build: 13B27) to OS X Developers and Non-OS X Developers (general users). It’s a first ever beta version of OS X 10.9 but users can expect more beta versions like OS X 10.9.2 Beta, OS X 10.9.3 Beta, OS X 10.9.4 Beta etc. from Apple. The Mac OS X Mavericks 10.9.1 Beta Update contains several new improvements, enhancement and bug fixes such as mainly focus areas of Mail, Graphics Drivers, and Voice-over etc. So if you're currently running a Final Version of OS X Mavericks 10.9 GM than you must upgrade/update your software to latest OS X 10.9.1 Beta. Apple's OS X Developers can officially download OS X 10.9.1 Mavericks Beta (Build: 13B27) from OS X Dev Center website and Non-OS X Developers (general users) can Download OS X Mavericks 10.9.1 Beta Version .DMG Setup/Update Files via Direct Links available below and after that you can install it manually via iTunes.