@@SMJAIN,
I was able to install VMware workstation 10 on Windows 8.1 preview flawlessly. Installtion was smooth & I have usedVMware Workstation technology evalution key for VMware workstation 10. Please check below guide,
http://mytricks.in/2013/09/guide-how-to-install-vmware-workstation-10-on-windows-8-1.html