I very much doubt this will happen, unless they includes extras with the game and make them like limited editions or something.
I am certain that if they are $20 more expensive, then I will not be buying them until they come down in price.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)