We're getting a lot of comments about the upcoming EOS 5D Mark IV, none of which I'd consider reliable. There have been lots of suggestions that Canon will launch the camera before the Photography Show which runs from March 19, 2016 until March 22, 2016 in Birmingham, UK. I think most suggestions are based on the fact that this was the first show that the EOS 5D Mark III was showcased at, however it was launched via a massively marketed global campaign, and was not announced FOR the show.
The most reliable information I currently have about the announcement date is that it will come after the EOS-1D X Mark II begins shipping, no other reliable source has disagreed with this.
The specification lists I've seen out there are likely conjecture. There seems to be a ton of clickbait articles about the EOS 5D Mark IV being passed around, and this is the first time I've seen these sorts of things for a camera launch.
There will be lots of talk about the EOS 5D Mark IV leading up to NAB in April, and I expect some information to make its way out during that time.
We'll be attending NAB this year and will once again team up with Planet5D for the multi-site live blog, that I hope to actually post to this time. :)