Sammydad - you are correct that they SHOULD work

Wish It would... However for me - so far - no dice unless I stay on 1.11.
I have an array of forwarded ports to various virtual servers inside the network. (HTTPS, LDAP-S, SMTP, RDP-S to name a few) I am also serving my own DNS and DHCP inside the network so I disable those facilities in the router. (hat proved problematic for me for other reasons on 1.2x but that's not in scope for this conversation) I do not statically assign IPs to my XBoxes - though I could if I had to via DHCP reservations.
I require the guest zone to allow well - guests to access the internet from my location without accessing the secure side of my network.
Because I'm 'working' on 1.11 (without the Guest wireless zone of course) and other issues that would affect the scenarios i use - I'm a little gunshy to try any of the 1.2x betas until i hear that it may make a positive difference for me.
-Hazmat