Why the Mac Pro was Announced on Wednesday?

If the Quad Core Xeon-based Mac Pro was expected, the way Apple announced it and its non-synchronized availability in all Apple Stores argue for a precipitated announcement. So why? Why would Apple have changed its strict rules regarding new product introduction on Tuesday? Knowing Apple addiction for secrecy, the Mac Pro announcement looks like the work of a beginner...
We might have found the reason of such precipitated announcement: introduce a new product to avoid commenting or talking about the "Guide to Greener Electronics: 3rd Edition" published by Greenpeace.
The reason is simple, Apple ranks last!!! ... again... and while most companies seem to have taken action to improve their ranking and modified their policies towards a more environment-friendly behavior, Cupertino did not change anything. If the buzz around the brominated flame retardants specifically seems to be overestimated as confirmed by the EU; they are numerous other points concerning policies and practices for which Cupertino did not improve its ranking.
So, if Apple really rushed to announce the Mac Pro to avoid talking about the "Guide to Greener Electronics: 3rd Edition" as we think, this is a really weird behavior; and probably deserve Cupertino more than it would expect.
There might be other reasons for such chaotic Mac Pro announcement yesterday, but we failed to find another one...