Well, since SP2 just came out last week, I'd expect it to take a little while before VMware updates all their documents. Also, if they are marking it as Supported, they need to run internal QA cycles on it. That takes time, you know.
no problems here with SP2 in my guests. like the above poster said there are known issues with old nic drivers and the scaleable network pack that is enabled by default. there are kb's that walk you through disabling the new network features so you should still be able to deploy SP2.
What kind of VM are you using?
VMware supports MS W2K3 with SP2 otherwise VMware can close their firm.
Maybe you have to upgrade your VMware to the latest level to support the latest levels of MS products.