With the announcement of VSAN GA announcement last week, everyone knew that vSphere 5.5 update 1 would be available soon because it is required for VSAN.

VMware released vSphere  5.5 update 1 today (11 March 2014).

You can download all the components here .

What’s new for vCenter 5.5 Update 1

• vCloud® Hybrid Service™ vSphere® Client Plug-in, is now available in vSphere Web Client.
• vCenter Server is now supported on Windows Server 2012 R2.

What’s new for vSphere 5.5 Update 1

• VMware Virtual SAN

You can check out all the details in the vCenter Server 5.5 Update 1 Release Notes & VMware ESXi 5.5 Update 1 Release Notes

According to the vSphere 5.5 Update 1 release notes there is NOT a supported upgrade of the VSAN Beta –

Test Releases of Virtual SAN 
Upgrade of Virtual SAN cluster from Virtual SAN Beta to Virtual SAN 5.5 is not supported.
Disable Virtual SAN Beta, and perform fresh installation of Virtual SAN 5.5 for ESXi 5.5 Update 1 hosts. If you were testing Beta versions of Virtual SAN, VMware recommends that you recreate data that you want to preserve from those setups on vSphere 5.5 Update 1. For more information see Retaining virtual machines of Virtual SAN Beta cluster when upgrading to vSphere 5.5 Update 1 (KB 2074147).