There seems to be a lot of problems with these type of offers. If the process doesn't happen then there isn't any adverse publicity to shame them into honoring the deal. I bought a television last year with a £50 cash back deal. Despite sending in the receipts they gave me the run around and they didn't send the cash. The moral of the story is buy the product if you really want it and don't rely on the "bonus" add on.
I get really sick of the way companies abuse sales-stimulating strategies like this. I would have bought a D700 anyway, so it was a bonus as far as I was concerned. There's a fair body of opinion that it's a lot better than ACR, which I have used previously, so it seems worthwhile to get familiar with it. I just downloaded the evaluation version of DxO too, which looks like a winner on account of the lens mapping function which covers my principal lenses. When I'll get a chance to evaluate this stuff systematically is another question.
I sent Nikon "help" (which previously just bounced me off to the "not how it works" phone number) asking for a specific clarification of, er, how it works. I don't know if it's just a function of advancing age but I'm no longer prepared to simply accept this sort of nonsense. I'll mention the words "telecoms suppliers" in this context...
I'll post any response I get from them, and the eventual outcome.