To accommodate 4K content, both the L8400 and L9400 are equipped with HDMI 2.0 which supports up to 4K at 60 frames per second (60FPS), HDCP 2.2 to ensure the security of the 4K content, H.265 HEVC which is the latest compression protocol which allows movies to use much less bandwidth. Without HEVC any kind of content distribution would be very difficult, or very expensive – possibly both, so this is a big deal. (HEVC stands for High Efficiency Video Coding).
As usual, this is a smart TV, but unlike lower-end models, they come with a quad-core processor, and support keyboard and mouse via Bluetooth. The L8400 is a 58” TV while the L9400 comes in 58”, 65” and 84”. Toshiba told me that the 65” size is starting to get some real traction in the market and that it was becoming increasingly important. As people switch to 4K, I also think that they will demand larger screens since the image quality over 1080p start to be very noticeable beyond 55”.