Sony usually lower the price during March's so next March is probably a price cut to $399.
Uncharted is this year and MGS4 is next year so if you get it next year you can get 2 games instantly and then GTAIV comes out and your set for a month or two.
End of 2014 Hardware Predictions (03/03/14)
PlayStation 4: 12-15million
Xbox One: 7-10 million
Wii U: 8-9 million (Changed 01/04/2014 from 7-9 --> 8-9 million)