> Does this mean that future hardware releases ie 3.x, 4.x ..., the samples undertaken > will all be compatible with the hardware 3.0?
I doubt anyone knows, let alone the Domesday Duplicator developer Simon Inns.
Sometimes you have to take a risk on acquiring things like this recognizing that you may, in several months, need to acquire new circuitboards and re-dump your games, until development stabilizes. You can try to wait it out, but by that point your discs may have developed more bitrot. It's a crapshoot.
However, don't be afraid for the arcade dumpers regarding that recent announcement, I don't believe many arcade dumpers on The Dumping Union have actually received Duplicator boards yet, so they won't run into the 2.0 -> 3.0 backwards compatibility issue yet.