Looking at the VMware vCenter 4.0 Update 1 Release Notes, it appears we may be looking at 64-bit only versions of vCenter Server in the future:
“Future releases of VMware vCenter Server might not support installation on 32-bit Windows operating systems. VMware recommends installing vCenter Server on a 64-bit Windows operating system. If you have VirtualCenter 2.x installed, see the vSphere Upgrade Guide for instructions on installing vCenter Server on a 64-bit operating system and preserving your VirtualCenter database.”
I’m hoping this won’t be a deal breaker for anyone as we should all have 64-bit hardware in the datacenter by now. However, we may be temporarily inconvenienced with Windows Server platform upgrades from 32 to 64-bit.
In the same document, I also noticed verbiage about VMFS-2 support going away in future vSphere releases. If you’re not completely rid of ESX2 and VMFS-2 in your environment by now, I’d start planning on it soon.