A couple thoughts:
1. Apple wouldn't drop the price on a product that was only released one week previously. They may take liberties with customer service, but price drops no more than a week later is below even Apple's belt.
2. Sometimes I wonder if leaks before Apple announcements aren't encouraged. They might be orchestrated (or, at the very least, tolerated) much in the way that leaks are used by political entities as a noncomittal means of guaging response before news is made official.
For example, we have strong reason to believe (if not outright confirmation) that when iLife was announced last January, they were going to charge for the whole thing until they saw the uproar and decided to only charge for the box set/iDVD.
So maybe last week's timely leaks about the updated G5 lineup was a way to get a sense of public sentiment about the update. Perhaps they had prepared a number of graphics pages with different price points on them, depending on the reaction at places like here. The one that showed up this morning was in the discard pile and somebody or some program accidentally put it up a week later at about the same time of day.