The big thing in 2015 are 4K screens. Several years ago, high definition (HD) became the norm. Running at up to 4 times the resolution of the previous standard (SD), it offered sharper, brighter pictures. At this point it is now the norm; aside from the bargain basement no-name sets in the supermarkets, all new televisions are HD and with HD tuners. The resolution on these sets is 1920 x 1080, hence the term '1080p'.
History is now repeating itself - sort of - with 4K television, also referred to as UHD or Ultra High Definition. Once again, the resolution has improved by a factor of four: with screens of 3830 x 2160. Initially these sets sold for silly money, but prices have plummeted in recent months. It will soon be the case that is little to no price overhead associated with 4K, and only the very cheapest sets (back to the supermarkets again) will be 'just' 1080p. So, 4K televisions are posed to just happen regardless.