I reckon MS will release the Elite while reducing the cost of the core and premium systems to boot.
The drop in the Canaries from 600€ to 550€ is probably bring done by the shops rather than Sony similar to what Play and WHSmith is doing with the price from £425 to £399.
The PS3 sales has started to slump and 360's are selling quicker than PS3's now (apart from Japan).
They will be forced into reducing the cost sooner rather than later. Don't forget, MS already have a user base of 10m and it is slowly getting larger. We know that people want a PS3, but just cannot warrant the high cost at the moment. Sony need to reduce it to a level where it becomes a much easier choice to spend a little more money to get a PS3 than a lot more money.
A larger selection of titles would help as well.
I also believe that Sony will start giving a few movies with the unit to try and shift it first...but people want a cheaper model first and foremost and they want the choice of what they want to buy and when.
It needs to drop by £100 in the UK b4 Xmas IMHO.
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)