I emerged app-emulation/vmware-workstation-188.8.131.521240 (after unmasking required parts) and it installed and ran, however when it ran it froze the whole system, being in the vmware group seems to have solved this.
I think that the installation summary should mention users wishing to use the program should be in the vmware group, like in this example from media-libs/jpeg-8c-r1:
>>> Messages generated by process 11243 on 2012-01-30 11:57:42 GMT for package media-libs/jpeg-8c-r1:
If you are switching from media-libs/libjpeg-turbo you might need to
rebuild reverse dependencies:
# emerge gentoolkit
# revdep-rebuild --library libjpeg.so.8
NOTE: The --library argument is important here.
Done in the overlay, will move to the main tree soon.