Any upgrading vsphere 5 to 5.1 gotchas with vShield, vCloud and XenDesktop

Hello.  I am starting to do some research about upgrading from vsphere 5 to 5.1.  We utilize vShield and vCloud director in our environment.  The vShield\vCloud environment is not really complicated.  We are running some test vapps and that is it.

We also have some VMs running an older version of citrix XenDesktop and XenApp.  Before I started my position at this company, the upgrade was attempted but there was an issue with the XenDesktop(version 4.0.4522) VMs.  I'm not really sure what the issue was.... but they rolled back to esxi 5.

Are there any documents that talk about the upgrading vsphere to 5.1 when you have vcloud, vshield and XenDesktop in your environment?

Thanks for any information you can point me to or provide!