Cameron has already stated the initial Blu-ray release will be 2D. As much as it'll pain me to watch it at home in 2D this year (already saw it in IMAX digital 3D in a theater), I have a feeling we won't see 'Avatar' on 3D Blu-ray until year's end or even sometime 2011.
Only a handful of 3D Blu-ray players were announced at CES recently, of which only one, by Panasonic, will have HDMI 1.4. The PS3 is said to be 3D firmware-updatable, but as it's HDMI 1.3, I don't think it'll be able to do full-res 3D. Then, there are 3D displays and initial cost. Front projection would be the way to experience 'Avatar' 3D Blu-ray at home, so I'm hoping we'll see some announcements at CEDIA. But, I'm guessing initial costs will be too high. Given all this, 2011 is looking more like the year for 3D at home.