You're right, to some extent it is what I'm talking about, however they state "People in these circles who also enable chat will be able to see when you're online and chat with you." and it feels like more of an all-or-nothing system (adding or removing Circles entirely from Chat).
Whereas Facebook's single-click 'on the fly' interface is superior to this - all groups always visible, one-click online and expanded, one-click offline and collapsed.
Whereas Facebook's single-click 'on the fly' interface is superior to this - all groups always visible, one-click online and expanded, one-click offline and collapsed.