A:AnswerYES and YES.
The thing about 4k TVS or 3D TVS, you need the whole system to b 4K or 3D in order to enjoy full 4k or 3D. If your cable provider doesn't support 4k, your TV can not display 4k.
In simple words you need a 4k Dish receiver and PS4 supports 4K. If you have a DVD player it needs to support 4k. You cannot input a 480, 720 or 1080p signal and expect to get 4K resolution.
A:AnswerYes, this TV will be available for $200 during the doorbuster sale at 5pm Thursday. I'd recommend calling your local store to see how many they'll actually have and if they are handing out tickets for items on a first come-first serve basis.