Sony announced at Tokyo Game Show that they plan on selling 5 million units of PlayStation 4 by the end of their fiscal year (March 31, 2014).
Last week Sony's Jack Tretton talked to Fox Business about the upcoming launch:
"We can pre-sell every unit we can manufacture, and the good news is that production yields have been phenomenal. We're going to work very hard to make sure that every consumer that wants one gets one."