I can't believe Canon will do nothing with their DSLR lineup next year.
Six months or so ago, I was trying to buy Canon's 'state-of-the art' camera, the D60. Remember that one? There was certainly a degree of suprise online when its replacement was announced, as the D60 was well received and considered a market leader in its segment.
Luckily I picked up on the fact that the 10D was about to be released, and I few weeks later I had an early version of this camera (at a premium price unfortunately, as it was still hard to source one at that stage).
Subsequent internet buzz seemed to suggest a '3D' was going to be released sometime soon. There's still a lot of speculation about this.
Before you knew it, the 300D/digital rebel was on the market, which also suprised many. A lot of people thought Canon was competing with it's own 10D, but I'm guessing their sales figures are looking very good indeed.
To the suggestion that Canon will repond to what Nikon releases, my impression given the past years events is that Canon will continue to try to set the pace, and at this stage their size and R&D budget seems to be making it hard for others to keep up.
A '3D' would make sense in terms of model lineup, but it won't be a direct replacement for the 10D, as I'd expect its price to be significantly higher. A 1D replacement does appear imminent.
But I think the lesson of 2003 is that we are likely to be suprised by whatever happens!