If buying a ps4 from Game at a midnight launch I hear there'll be a few deals on offer:
LEGO Marvel Super Heroes half price £25
GAMEware Vertical Stand or GAMEware Starter Pack for half price
Call of Duty: Ghosts for £40 (or free if you trade in a current-gen version of Ghosts previously purchased at GAME)
£10 off a number of games (Killzone: Shadow Fall, Knack, FIFA 14, Battlefield 4, Need For Speed: Rivals, NBA 2K14, Madden NFL 25, Putty Squad)
£10 off a PlayStation Plus subscription.
Official licensed stereo headset for £69.99 (£30 saving)
Reduced price BluRays (£12.99 each: The Wolverine, Man Of Steel, Despicable Me 2, Kick-Ass 2, Alan Partridge: Alpha Papa, Pacific Rim.)
Possibly other deals. I'm not sure whether these deals are set in stone or just rumour but I've seen mention in a couple of places.