Stab in the dark IMO, because of the increase of the deals for the 360, I expect the 360 to reduce to around 260k next week whereas I expect the PS3 to increase to around 390k.
In short I expect there to be anywhere from 100k-130k of a difference worldwide.
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)