Motor1.com seems to think that the spy shots we've been seeing could potentially be the new Chevy Traverse rather than the 2018 Chevy Blazer. They have a sliding photo on their website (link will be posted below) but for some reason I don't think it's the new Traverse. The front end looks like it's been stubbed down quite a bit compared to the ongoing Traverse for one, well all of the profiles seem to be shrunken down in general. An updated Traverse I would expect to keep very similar dimensions and just have a change of features ie. headlights, tail lights, DRLs even, etc.
https://www.motor1.com/news/130556/2018-chevy-cuv-spy-shots/?
https://www.motor1.com/news/130556/2018-chevy-cuv-spy-shots/?