Prior to the latest announcements from Canon, it was also rumoured that Canon would be adding 4.2.2. internally to the Canon Cinema EOS C200 and RAW video output to the Canon EOS R when using an external recorder such as the Atomos Ninja V.
The Canon EOS R raw recording may have originated with the following tweet from @CanonUSApro. Canon USA later backtracked and said they were talking about photography RAW, but that honestly made zero sense to us or anyone else.
As for 4:2:2 internal 4K being added to the Canon Cinema EOS C200, the person that sent that to us was correct about some other things, so we're not sure what to make of it.
NAB doesn't start until tomorrow, and the big start is on Monday, so there is a possibility we'll see another announcement from Canon before the doors open in Las Vegas.
Some have suggested all of this may have been a “troll” from Canon USA, but that's simply not the way Canon USA works, they don't like rumors or rumors sites and I doubt they'd get in on the fun.