On pricing between Canon and Nikon, there is more there than just the costs associated with manufacturing. It's a little like Porsche and Chevy. A 911 will always cost more than a Corvette. The Corvette provides tremendous value for the dollar, but Porsche isn't about to drop the price on the 911 because the Corvette is cheaper.
For many years, it's been perceived (rightly or wrongly) that in the digital arena, Canon provides a better product. (The technical innovation has certainly surpassed most of the competition.) As such, they believe their product is worth what they charge, regardless of competition. The 1Ds2, has held pretty steady at $8K because it has no direct competition. Even the 1Dxx has held pretty steady because, while the D2x comes close, to Canon, it's no cigar.
The advent of the new D300 and D3 may have a very slight pricing effect on the new Canons (or at least the 1D3), but not much. The 5D has seen far greater discounting because it's perceived by Canon as not a top-tier camera on the level of the 1-series, and therefore more at risk from Nikon competition.
Personally, I wouldn't trade my Canon's for anything else on the market. I think, after all these years, Nikon has finally hit the sweet spot with it's new cameras.