There will probably be no new Canon DSLR cameras announced in 2011. Usually Canon and Nikon release new products just few weeks apart (sometimes even days apart).
I still have not received any conclusive evidence that there will be a new full frame DSLR from Nikon any time soon. Judging by the number of events organized by Nikon for the upcoming mirrorless camera, I seriously doubt that they will announce a new pro camera overnight, without any media preparation (like they did with the 40mm macro and 50mm f/1.8 lenses).
There is a very good chance for at least one more announcement in 2011 after the mirrorless event on September 21st – in the past few years Nikon always had new products introductions in the October-December timeframe.
