I received a message from my local Gamestop saying that this Sunday only they would be offering a 90% trade in bonus for anyone who has preordered the PS4 to go towards the system.
This bonus is for systems only
PS3, Xbox 360, Wii, Wii U, Vita, DS & 3DS
Credit must go towards system but any left over you can use towards what ever you want.
Also as a side note they also said for they will only be holding PS4 for 48hrs so if you cant pick it up in that time frame make arrangements for someone else to pick it up
Joystiq is now promoting the trade in deal
Also they will be doing the same thing for Xbox 1 on Nov 17th (Credit goes to brownda1 for finding the gamestop link)
Thanks IkedaTeramusa for the Image