G'day Sherms,
I think Sensis versions are going to be quite less frequent than Navteq, going by the sporadic Sensis versions issued since Navteq became Garmin's map data provider of choice. I personally suspect that there may still be an unexpired contractual arrangement between S & G. However, I'm less strong in my conviction on that theory as time passes since the change from Sensis to Navteq back in February 2011. Certainly Garmin purchased Navteq map data for AU/NZ before then, but only loaded it as OEM onto delz and the "truckie's nuvi" 465T units i believe.

My guess is that eventually Sensis will disappear.