Workstation 8 with Studio 2.5

...does work, with some assumptions. The new Workstation 8 literally merges the Server product-line (ex-GSX) with the Workstation product line, that's called VMware Workstation-Server service. It supports autostart features and finally a usable remote management interface, by using another workstation as client. It also supports the workstation as a client of ESXi5 or vSphere5, but that's off-topic now.
So, this server-service runs on Linux64 at my box, and I'm using it as a build-host for my Studio 2.5 projects. On WKS7, You had to run the Workstation with #/usr/bin/vmware all the time You wanted to run a VM. That called for a vncserver of course. Now, WKS8 supports running VMs as a service. The issue is: if You try to build a Studio VM, You still have to run the Workstation GUI (on the vncserver for example), otherwise the build will fail. This limitation will probably disappear in the next version of Studio. Also, old build VMs stay in the WKS library, even after deleting their files, this worked in WKS7 better.