Canon has one of the shortest "new" product marketing cycles of any vendor
out there. Price drops in the Canon line often signal the end of a product
life-cycle. Not to worry: if Canon follows its usual practice there will be
a newer and "better" 5D which, like many "new" Canon products is mostly a
new box and a tweak to the software interface. The constant appearance of
seemingly "new" products boosts the image of Canon as a relentless
innovator, and they have brought some innovative products to market, but
most of their product line is recycled and evolutionary, rather than
innovative.
That being said I would still get a 5d if I could find a way to use it with
my closet full of Nikon lenses.