<p>I don't think you're thinking hard enough about why this approach might be better than a recall in the case of one or more known defects in early versions of a particular camera model. A recall amounts to admitting fault, which may have legal implications. A recall requires that they treat everyone the same with respect to fixing problems, and probably has a higher response rate. Doing this, they can spread repairs out over a period of time and decide to issue a recall later. Also, it may well be that they suspect there's a recall-level problem with the cameras in question, but they're not sure, and wish to use a program like this to collect information about them.<br>
<br /> I think that keeping an eye, over the next couple of months, on reports from people who do take them up on this offer will probably yield useful information about what they're doing. If, as Shun suggests, they are simply using it to drum up repair business, then we should hear people reporting that they're being asked to pay for repairs after sending in their cameras. My prediction would be that they return many cameras with significant part replacements for free.</p>
<p>Edit: One motivation for this may simply be to collect data on the performance of cameras that didn't have certain engineering changes. Even that seems more likely to me, given Nikon's history of not using repairs as a profit center, than scaring up repair business.</p>