Ars Technica has the nuts and bolts of how and why retailers are coming up short on the high end iMac, but the bottom line is that the 3.06GHz 24-inch iMac is becoming scarce.
It’s likely that this is the end of the line for that model, but don’t expect a major exterior redesign on the product. This generational look is still pretty fresh, and was recently extended to the Macbook line – so its safe to say the overall design of the iMac will be remaining the same for the near future.
The internals on it are likely, however, to get a refresh very soon. So keep that in mind before you go making a desktop purchase over the next few weeks.