In all honesty, why on earth would Apple start manufacturing TV's.TV hasn't been huge success so why would "set top box built into a monitor" be any different. Anyway, all the major players in TV set business manufacture their own panels in their own factories to achieve better profit margins with attractive price point. Honestly, why would Apple want to compete in that market?
I might be totally wrong but I think Apple will never release a TV set. There will be more capableTV set top boxes but never TV sets.
Easy, they will be priced significantly higher so they will have a higher profit margin than the other major players, simply because it will have an Apple logo. Apple is in a position where they simply have enough fans that will simply buy their stuff simply because they made it and no other reason, so they don't have to go into it with the goal of selling millions of units, they can just simply sell less for maybe 2x, 3x the price of similar sized TVs. Plus don't forget the free media blitz when they finally introduce it, that alone will equal lots of the TVs being sold. So pretty smart move by Apple. Very impressive.