I don't think either PS4 or Xbone will have huge sales this holiday season, their line ups are simply not good enough and majority of 3rd party games are still cross gen.There is still little reason for the mainstream gamer to jump to next gen. Destiny is a great call by Sony and the bundle will help immensly though.
Sales won't be bad or anything but some crazy Wii or PS2 levels are out of question imo.
I agree though that it's a good idea to have LBP 3 so quick on the PS4, as with all the Lego, Disney, and Skylanders games + LBP, it starts to become a viable platform for kids.
What is good for PS4 though is that it has a very good chance to maintain the strong holiday momentum into next year with games like The Witcher 3, The Order, Dying Light, Dead Island 2, Bloodborne being all currently slated for Q1 or "early" 2015.
So it is happening...PS4 preorder.
Greatness Awaits!