This has probably been reported, but I didn't find it on the Forums. Easy fix!
Fusion 5.0.3 (on HOS 10.8.4) I created a new Mac 10.8 VM. Noted that the keyboard profile was set to 'default', not 'Mac'. As visible under the VM Settings > Keyboard & Mouse, is at 'Profile - Default', not 'Mac Profile', as one would expect.
This could make some people think that keyboard on Mac VMs is not supported as well as it is.
Might also be good to clean up the names of the profiles in this GUI.
Currently (all under a header 'Profiles' in Fusion settings, or after 'Keyboard & Mouse Profile:' in Fusion preferences):
'Mac Profile'
'Profile - Default'
'Windows 8 Profile'
As profile is already mentioned in both cases, suggest:
'Mac'
'Default' (though what is this, old Windows, or General, or ...? If possible better to describe what it's for.)
'Windows 8'