NAB 2019 takes place in April of 2019 in Las Vegas, Nevada. The show generally showcases the Cinema EOS lineup, but very rarely the stills camera products, outside of the EOS-1D C from many years ago.
We're told that Canon will be showcasing the advances in its 8K offerings for the trade show, though no 8K products are going to be “officially announced” until later in 2019. Canon has shown off their 8K offerings at the Canon EXPO in 2015, as well as at NAB 2016 & NAB 2017. However, the NAB 2019 show will bring us a clearer picture of Canon's plans we're told.
We have been told that the follow-up to the Cinema EOS C300 Mark II will have an 8K option of some kind, but not to expect the camera until late 2019 at the earliest.
Canon has admitted in the past that they were late to the 4K revolution and that they wouldn't make the same mistake when it comes to 8K. We expect to see the likes of Sony and Panasonic announce 8K products in 2019 and 2020.