The other thing to consider is that iPhoto and Aperture are developed by the same team. Especially now that they share the same library, it should be relatively easy to move from one to the other depending on workload. But if I had to bet money, I would say the job posting was for Aperture. The 'largest library' also indicates Aperture.
As a pessimist ... if this job posting is supposed to beef up the team for the next update, then it is going to be a while yet.
as an optimist ... a developer may be retiring, but had agreed to wait until the next update was finished, which means it is close to release.
However, I'm Canadian.... so current state of the glass simply means it is time to order the next beer.