Hi Friend,
As per ESXi and vCenter server release notes : I do not see any references where windows 2012 is supported.
Ref 1. VMware vCenter Server 4.1 Update 2 Release Notes
2. VMware vSphere ESXi 4.1 Update 2 Release Notes
On certificates front, there should not be any issue from vCenter functionality perspective. You will have default certificates installed.