The D7000 is, I think, much like the Pentax K-5 in this regards (the reviewer is incorrect on his assertion about camera support). The camera is compatible with version 3 of the SD specification (SDXC) but that doesn't mean that the camera has the necessary hardware to take advantage of the greater transfer rates, though it can take advantage of some speed gains since SDHC cards don't usually hit the max for their specification. SDHC devices can handle SDXC given the right drivers and software, but that doesn't mean that they can take full advantage of the specs.
I think this, to some degree at least, bears out with the testing described in your links with some gain on the other card, but probably not enough for most shooters to spend the extra cash. Gotta love the transitional period, it leaves people unsure of what to buy.