For whatever reason, the product I had been asked to test has been pushed back to an indefinite date, and so I won't be going back to Nintendo in the near future. It's disappointing, but not particularly surprising. As low on the totem pole as being a tester is, there's always the expectation that this might happen.
Not that this day has gone to waste. I've used quite a bit of it to catch up on hunting for a full-time job, sorting things out and contacting a few people. Should Nintendo come calling before I'm employed elsewhere, I'll happily go back, but it's not something that I can always count on.