Along with many other announcements that took place during this morning's conference, Sony revealed that PS4 and PS Vita will be getting themes in next system update. As a feature that was present on PS3, themes has been considered by Sony as a highly request feature for the PS4 ever since it's launch.
During their briefing, a small video showing how a dynamic theme works on the PS4 was shown. Players will be able freely customize their consoles with themes when the next system update launches this fall. This system update will also add the Share Play feature, a YouTube app, and much more.
Sony has yet to reveal which themes will be available when this feature launches, and if these are free or will have a cost.