Nikon are delaying the announcement of the D800 likely due to the flooding in Thailand - check out Nikonrumors.
I would be very surprised if Canon announce another dSLR this year - too close to the 1Dx.
26th will not be dSLRs, likely printers. 3rd Nov will be some camcorder(s) which support(s) EF & PL lenses.
Just my 2c...