The word of the day at this NAB is 4k. It took 12 years for the American market to implement HD and now the manufacturers try to push for higher resolutions. Spearheaded by NHK that was a pioneer in this Ultra High Definition field when HD was mainly talk, and that has a scheduled broadcast in 4k in 2014, the companies display all needed equipment for production and post production in 4k or 6G-SDI. Occasionally you may encounter 8k cameras and the associated RAW recorders and DownRes equipment that would enable to monitor them on 4k displays.
NAB 2013, Las Vegas, NV