Currently I see the TCAS data only in the TRFC page.
There appears to be no "overlay on map" functionality, as there is with the WX500 stormscope data.
The map display does however show the little aeroplane symbol, next to the lightning symbol, which tends to suggest the traffic data should show.
The system is an Avidyne 605.
I might not have this 100% right, but on the G1000 I think you only get it on the map if you are "heading up."
That is no traffic displayed if you're map is North Up.
I see traffic on the entegra avidyne map.
The display is heading-up.
An interesting point though, because the 600 doesn't have a heading input, which is one of the reasons I chose the considerably more expensive 605.