This has it that Canis Rex will be a complete box set for his release. Canis Rex is the name of the Imperial Knight that Sir Hekhtur rides. We saw more about him earlier from a preview on the Warhammer Community, and I will link that below.
Here is the new information that was sent in to us today.
Huge thank you for sharing with the community. So glad its just not an upgrade set.
Here are some pics of the model as shared by the Warhammer Community and in case you forgot just what this all looks like.