My point is that this is unofficial stuff and I would personally suggest that people try not to make the SD Association too much aware. This just might speed up the conversion to SD 4.0 which the current manufacturers is currently going through.
know what your saying but they'll have the marketing strategy laid out two generations in advance, and there will always be an array of oem producers waiting to roll out the 3.0 cards at a greatly reduced price.
the issue may be that they adapt production somehow in order to disable the current compatibility, probably by producing crippled 4.0 cards under the 3.0 label, which in turn would get a whole big argument going amongst users as to if it works or not, newer users all confirming that it doesnt.
although thats a huge extra cost so i doubt it will happen anytime soon.