Citrix has released its Receiver app for Windows 8 devices today. They released their preview version back in September and the final release is now in Windows Store today.
Specific configurations are required for this release; please ask your IT department how to get started.
Citrix Receiver lets you access your enterprise files, applications, and desktops to help you be as productive on the go as you are in the office. If your company uses Citrix, you have the freedom to work on your favorite device from wherever you are.
What you can do with Citrix Receiver : Experience simple, consistent, and delightful file and app access from all of your devices
For more information about Citrix Receiver, visit http://citrix.com/receiver.
Securely deliver virtual desktops and enterprise apps
Work anywhere, on any Windows 8 device
Download it here from Windows Store for free.