Besides, since the 1Ds2 was annouced in Sept 04, I would find it very surprising if Canon were to release a new flagship model before Sept 06, which is still 16 month away at best.
True, but there are two important things to keep in mind here:
1) The 1D MkII was announced shortly before the end of 2003, two years after the announcement of its predecessor. The successor to this camera is due for an announcement around Christmas this year, if Canon wants to keep the same schedule.
2) Nikon's D2X is putting pressure on Canon from the cheaper end, and Mamiya ZD is putting pressure on Canon from the expensive end. It would be good PR for Canon to announce a successor for their top models this Christmas, although a few 1Ds MkII owners might be miffed for a few months like the Epson 4000 owners were.
So Canon
may have something up their sleeve. Well, they most certainly have something up their sleeve, but whether it's an ace or the two of clubs, and when they're going to play it, remains to be seen.