Seems pretty clear that for Xb one to be viable in the USA it needs to have skus $50 cheaper than the base PS4 price. It'll be some time before PS4 drops down to $250, so I imagine Xb one will live at $250 for a while once it's forced to drop there when PS4 inevitably officially goes to $299 at the end of this year.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix