Xb one should drop by about 50% this week. I'm picking there are thousands of inFamous bundles sitting in back rooms ready for Friday, and there should be stock that's also released for the weekend. So I expect at least 11K again in UK for PS4. But stock issues means they won't be able to meet all demand. A global launch of inFamous is going to put significant strain on PS4 supply. As many people love to point out PS4 has no worthy AAA exclusive games on it (one could argue that Xb one is remains in that situation), and inFamous is likely to be the first AAA game both in quality and production, so there will be many people looking to get PS4 this weekend. I know I am, and I have my inFamous bundle pre-ordered, it is also $50 (NZ) cheaper than buying PS4 and the game separately, so it's effectively a temporary price cut, not quite a giveaway but a bloody good deal nonetheless.
On a side note, I've decided that since I'm signing up to PSN+ AND Tomb Raider PS3 is free on PSN+ this month I won't be getting the definitive edition for PS4 after all. I mean free and good looking > expensive and great looking. That's my motto with games and women 
“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
