Canon EOS 3D X is around there...

Canon is going to release it's newest DSLR with 46 MP which will the leader in Mega Pixel game for now. Here are the specifications given in CR. Release date is not yet published but most probably it will release early in 2013?

Canon EOS-3D X Specifications

• 46 MP
• 3.7 frame per second
• Dual DIGIC 5+
• ISO: (25) 50-6400 (12800)
• AF: Same as 1DX
• USB 3
• CF+SD

Another feature mentioned about the camera is better heat dissipation of the sensor compared to other EOS cameras. Apparently, this results in industry leading low ISO performance.

Source : CR