It seems that Toshiba believe in a 4K future as they have announced their new Series 9 range of televisions.
Consisting of three models at the moment with 58", 65" and 84" screens, all feature a 4K display (3840 x 2160) and 3D capabilities.
The sets also feature 4K upscaling using Toshibas CEVO 4K processor. This is a multi-processor system that provides full 4K resolution for TVs, with 3D support and Active Motion & Resolution, a processing technology that provides higher sharpness in moving scenes.
The series 9 sets are of course also "Smart" with Toshibas take on online access called Cloud TV. This allows access to Netflix, iPlayer, YouTube etc without another set top box.
The series 9 TV's will be released soon but no word on pricing yet.