Well, I'm very happy that my ADV is still current. It is unfortunate for D and J owners whose models have clearly been replaced by the G61R. I can't see software support for these variants ending, but I wonder if support will extend to hardware upgrades? MConfig does not ask whether or not a G68D or G68J has the forthcoming USB card; it does for ADV, AXV and XXV*.
AXD and XXD: USA only! Loses video switching, but adds digital surround out with MHR.
I guess the (install?) market for balanced analogue audio is big in the States so Meridian needed G68s with both balanced analogue and digital outputs (which the AXV and XXV didn't offer). Analogue video switching is completely old hat now; no surprise to see it go.
My only surprise is that the AXV and XXV haven't completely given way to the AXD and XXD and, to a lesser extent, that the ADV has been retained.
* This doesn't mean that a card upgrade will be offered, but I'd be surprised if it wasn't.