The most likely scenario would probably be that Pro get's phased out before PS5 launches, so no slim model.
If PS4 and/or Pro stick around during PS5 then they should get slimmer models holiday 2019.
A 2020 PS5 should mean no more PS4/Pro hardware changes that year or beyond.
PS1 - ! - We must build a console that can alert our enemies.
PS2 - @- We must build a console that offers online living room gaming.
PS3 - #- We must build a console that’s powerful, social, costs and does everything.
PS4 - $- We must build a console that’s affordable, charges for services, and pumps out exclusives.
PRO -%-We must build a console that's VR ready, checkerboard upscales, and sells but a fraction of the money printer.
PS5 - ^ -We must build a console that’s a generational cross product, with RT lighting, and price hiking.
PRO -&- We must build a console that Super Res upscales and continues the cost increases.
