The NavTraffic tuners require a separate data port for that service that does not exist on those units so an update wont do anything for those units. Forget about a solution for any of the F and previous X series units but we may see a new tuner device to replace the separate MSN tuner for the Z110/120/X920 units. But remember, we're talking about Pioneer here, if you hold your breath you may die.
I was thinking they could make an adapter that connects the regular XM radio port and the dedicated physical port for NavTraffic data from the older tuner and combine the data on the same line somehow.
The newer units definitely have the processing power to "decomm" the data (as we say in the engineering biz...). The problems (obviously) would be re-programming the AVIC. Assuming BOTH types of data come in to the unit as digital, however, that should be possible.
The problem gets tougher if the XM radio comes in from the tuner as ANALOG, but even then I can think of some ways to do this off-board (i.e., pre-AVIC head unit). Depends how much time Pioneer wants to spend.
A new traffic tuner of some kind would be easier for them...and I wish they'd do it for the sake of all the AVIC users out there who rely on the MSN functionality presently.