Obviously with Nikon offering cashback, it was inevitable that Canon would do something similar.
Over on AVForums, they have a link to a site giving details of the German offer (i.e. in Euros) but it's reasonable to assume something similar here. http://www.northlight-images.co.uk/cameras/Canon_5d2_3d_7d.html
(after the pics from Focus in Imaging)
Either way, it might be worth holding off buying any Canon kit until 1st March, when full details will be available.