This will be just like the 6D MkII. Haters will abound, just like they did then. The camera will come out, and all will be resolved. This is propaganda 101. It will continue as an experiment into how far they can go to trash a product in the quest for dominance of the social media market. They failed to dog the 80D, or the 6D MkII.
It's already began, and watch how many detractors vs. unbiased observers chime in. I'm predicting 3 or 4 to 1. Mark my words.
I would like to continue to use my ES series lenses into the future, and the 90D may be the last of the camera's that will be using them as an option. The hate for this camera will trump all others, as that's where we are with social media now. Maybe the hate for this camera can drop the price quickly, like they did with the 6D MkII. Watch for an insignificant review to be pounced upon, like the ISO 100 fallacy of the 6D MkII's performance. Like the 6D MkII's performance, it will be a great seller.