I've just upgraded from a 5D mark1 to a 5D mark2. I'm loving my new camera and paired with the 50mm F1.4 I'm getting beautifully crisp pictures with sRAW1 files at ISO800, much better than my Mark1. It's a joy and the very little videoing I have done has already got me hooked. The texture of the video is just divine!
My point in relation to this post however is that just because I have bought a new camera that will probably last me 5 years or so I am still addicted to Canon Rumors! The forum here is the friendliest of any of the photography forums which from my limited observations can get quite nasty very quickly.
Gear headed obsessive geekiness is an instinctive male trait and nothing to be ashamed of. You can spend all day taking pictures and all night processing your raw files and still have time in your life for Canon Rumors!
On another subject, I think Nikon have shown all their cards with the D4, D800, D800E but no way have Canon. Whatever they announce next week you can be sure it wont be a direct competitor to the D800. That one is still in the pipeline. Anyone who jumps ship to the D800 based on what Canon announce next week will be kicking themselves in 6 months time when Canon announce their own 36MP full frame beast!
If you're invested in Canon lenses now you'd be a raving nutter to jump to Nikon. Just my 2 cents worth