My bad, yes it was in Q3 (lol, I'm the one who linked the article, shouldn't have made that typo...).
Back to the main point. The N1 received every Android update for a good 2 years, and now it's soon to become not last gen, but two generations behind. It is not going to stop working the day ICS launches.
Also, iOS updates are not perfectly equatable to Android updates, because as far as I know, Apple doesn't introduce new features independently from iOS updates like Google has done. So that iOS update is more important to the Apple user because that's the only time they get new features (again, AFAIK).
Anyway (I'm started to get this thread and the other one with that misleading graph mixed up), I will leave this thread for good with the opinion that it's not at all surprising for the N1 not to get ICS (officially). It's not the last gen phone, that would be the Nexus S.