B&H Has a fantastic write up of the new Canon 5DS and 5DS R Cameras. Read More on B&H Photo Official SpecsNote - No one is taking preorder of the bodies at this time.

• EOS 5DS for $3699 at B&H | Amazon | Adorama (available in June)
  • 50.6MP Full-Frame CMOS Sensor
  • Dual DIGIC 6 Image Processors
  • 3.2" 1,040K-Dot ClearView II LCD Monitor
  • Full HD 1080p Video Recording at 30 fps
  • 61-Point High Density Reticular AF
  • 150,000-Pixel RGB+IR Metering Sensor
  • ISO 100-6400; 5.0 fps Burst Shooting
  • Anti-Flicker Compensation
  • User-Selectable Shutter Release Time Lag
  • Dual Compact Flash and SD Media Slots

• EOS 5DS R for $3899 at B&H | Amazon | Adorama (available in June)
  • 50.6MP Full-Frame CMOS Sensor
  • Dual DIGIC 6 Image Processors
  • Low-Pass Filter Effect Cancellation
  • 3.2" 1,040K-Dot ClearView II LCD Monitor
  • Full HD 1080p Video Recording at 30 fps
  • 61-Point High Density Reticular AF
  • 150,000-pixel RGB+IR Metering Sensor
  • Native ISO 6400; 5.0 fps Burst Shooting
  • User-Selectable Shutter Release Time Lag
  • Dual Compact Flash and SD Media Slots

• EF 11-24mm f/4L USM for $2999 at B&H, Adorama, Amazon (available at the end of this month 2/28)
  • EF Mount L-Series Lens/Full-Frame Format
  • Constant f/4 Maximum Aperture
  • Super UD, UD, and 4 Aspherical Elements
  • SWC, Air Sphere, and Fluorine Coatings
  • Ring-Type USM Autofocus Motor
  • Internal Focus; Full-Time Manual Focus
  • Weather-Resistant Design
  • Rounded 9-Blade Diaphragm

Quote from Canon's Chuck Westerfall

Despite some rumors to the contrary, Westfall said the 50.6MP CMOS sensors in the 5DS and 5DS R are developed and produced by Canon. When asked whether they were created in collaboration with Sony as some rumors indicated, Westfall responded by saying: “Absolutely not. The sensors were developed completely in-house, by Canon.”

Canon 5DS & Canon 5DS R Specs: UPDATES in BOLD

• 50.6MP full-size CMOS sensor on both cameras
• 5DS R no low-pass filter
• 3.2 inch LCD 1.04 million pixels
• Raw (50MP), M-Raw (28MP), S-Raw (12.4MP)
• CF (UDMA7) and SD / SDHC / SDXC (UHS-I)
• Magnesium alloy body.
• Weather Sealed
• Dual DIGIC6 processor
• ISO sensitivity ISO100-6400 (Extended 50 and 12800)
• Continuous shooting 5 frames / sec
• High precision 61-point AF (41 cross type)
• EOS Itr AF (— Intelligent Tracking and Recognition also in the Canon 1Dx)
• 150,000 pixel RGB + IR photometry sensor
• Add a "fine detail" to the Picture Style
• 1.3x and 1.6x crop shooting mode
• Customizable "Quick Control screen"
• Time-lapse movie (not sure if this means it will create movies in camera from interval shooting)
• Anti-flicker
• Interval Timer
• Video 1920×1080 30fps (ALL-I or IPB)
• External Mic Port
• 1/200 Flash Sync
• Bulb timer (adjustable length in menu system like Canon 7D Mark II)
• USB 3.0
• Dimensions 152mm x 116.4mm x 76.4mm
• Weight  845g (body only)

My Thoughts (video)My quick thoughts - 50MP and ISO 6400 limit!! This is targeted at studio and serious landscape photographers. This will not be the replacement for the 5D Mark III and a jack of all trades camera. That will be the 5D Mark IV coming soon*, but apparently not as soon as these two. They will be officially announced next week along with the EOS-M3 and hopefully the Canon T6i (750D). *Northlight images is now reporting that the 5D Mark IV will be announced in August and feature 4k video with a modest increase in MP and targeted toward low light shooters.  August feels FAR away so we need to take these specs, if we can even call these specs with some healthy skepticism. I will change my tune from the video and say if we are waiting till August to see a 5D Mark IV I do think it is a good possibility that 4K video will be an option.