After PS3 and Xbox 1 prices, I don't think they can afford to mess that up. They can't come out too much cheaper than the rival. I reckon there's always a chance once one comes out first, the second cuts the price before reveal.
God bless You.
When PS4 will hit 100m consoles sold: Before Christmas 2019
There were three ravens sat on a tree / They were as blacke as they might be / The one of them said to his mate, Where shall we our breakfast take?