New! Mountain Lion Dictionary gesture works in Windows applications
New! Connect Thunderbolt and Firewire devices to either your Mac or your virtual machine just like you do with USB devices
Enhanced! The New Virtual Machine wizard makes it even easier to create new virtual machines, automatically locating operating systems on your machine or letting you manually select a range of media types to install

Performance
40 better disk performance than the previous version
Virtual machines shut down up to 25 faster than the previous version
Virtual machines suspend up to 20 faster than the previous version
3D graphics and web browsing is 15 faster than the previous version

Cloud
iCloud, Dropbox, Google Drive and SkyDrive optimizations eliminate duplication of files locally

Peace of Mind
New! Get stuff done in Windows 8 with a real Start menu and the ability to run Modern (Metro) apps in a separate window rather than in full screen
New! The Security Center makes it easy for you to be sure all your stuff is secure, both on your Mac and in your Windows virtual machine
New! OS X Mavericks (10.9) and Windows Blue (8.1) support

Whats New
Version 9.0.24217:
Resolves an issue with the OS X password not being accepted when exiting Full Screen.
Resolves an issue with the virtual machine bridged networking disconnecting after the Mac wakes up from sleep.
Resolves an issue with virtual machines booting to a black screen after upgrading to Parallels Desktop 9 for Mac.
Resolves an issue with Parallels Desktop crashing when switching a virtual machine to Full Screen.
Resolves an issue with copying and pasting pictures and screenshots into Microsoft Outlook 2010.
Resolves an issue with updating Parallels Tools in Ubuntu virtual machines after upgrading to or updating Parallels Desktop 9 for Mac.
Resolves an issue with vertical mouse scrolling not working in Autodesk Revit Architecture 2014 running in Coherence.
Resolves an issue with Autodesk Inventor 2014 crashing during the rendering process.
Resolves an issue with a warning about the software from an unidentified developer appearing during Parallels Tools installation in guest versions of OS X.
Resolves an issue with OS X virtual machines not booting on a Mac Pro.
Resolves an issue with a virtual machine hosting a Hyper-V virtual machine and crashing during the Hyper-V virtual machine restart.