According to third party product developers for Apple's iPod line, Apple placed its 60 GB iPod on its 60 day "At-Risk" list. The purpose of the list is essentially to warn resellers and product developers that it may make changes to a product, replace it with a newer model, offer a price reduction or discontinue it, among other things.
With rumors circulating around Apple's expected 30th Anniversary product announcement, the addition of the 60 GB iPod to this list could possibly validate rumblings a change or addition to the iPod line. The 60 GB iPod was placed on this list approximately a month ago.
News source: AppleInsider