When you update to OS X Mavericks beta 5, you might notice something rather exciting in your Applications folder: iBooks for Mac!
Double click on the iBooks icon to launch iBooks for Mac, and then click Agree on the iBooks Author Software agreement. You’ll see the iBooks splash screen as above. Click Get Started.
You’ll be asked to sign in with your Apple ID. Click on the blue Sign In button and enter your Apple ID and password. If you’re not ready to connect your Apple ID, click Not Now. When you do connect up, you’ll be able to get your purchase history from iCloud and sync your bookmarks, highlights, and notes you may have created on your iPad or iPhone over to your Mac.