According to reports , sources close to SONY have said that playstation uk team is looking to secure more ps4 units before 22nd nov launch day .according to them , it will be very difficult to satisfy ps4 demands  as release date comes closer.  the pre orderes have already surpassed their predictions.
Sony fears that if the demands are not met, their fans will turn to Xbox ONE which is also getting launched on the same day.

“We are very excited. We are very pleased to see such a shift towards PlayStation,” Gara said. “But we now need to think about the gamer, our retail partners and manage those expectations as much as possible.”
Gara said pre-orders for the PS4 are at levels Sony hasn’t seen in 20 years in the business of console gaming, and any forecast he previously provided is “now redundant and far too small.”

Sony’s Europe boss Jim Ryan told MCV-UK that PlayStation “has to do better” in the UK, a market in which the company is trying to wrestle back from Xbox