"David also told me in a pm that NTEK is working on all Seiki tvs"
That's correct. The ntek boxes, if they exist will work on seiki TV's and EVERY OTHER TV MANUFACTURED that has input ports, because TV's are all the same and the brand doesn't matter. The box will still work if the TV DOESN'T have 4K. Trying to brand with Seiki is a ploy. Seiki didn't 'partner' with ntek.
I wonder how much ntek is paying seiki to use their brand name. Matter of fact, I hope Seiki knows ntek is using their brand name.