5D Mark IV will Also Coming with 4K Video and High ISO Features

The new Canon EOS 5Ds, to be announced next week.

Along with the 50.6MP high megapixel Canon EOS 5Ds, Canon will also announce the real 5D Mark III successor: Canon EOS 5D Mark IV.
Canon EOS 5D Mark IV will focus on low light events and sports events, also 5D Mark IV will feature a 4K video recording. See the rumored specs below:
5D Mark IV Rumored Specs:

• High ISO
• Focus on low light,  sports events
• 4K video recording
• New video features
• Modest increase in megapixels
• To be announced in August, 2015

via: CR