Actually, it could be the same wall-mounted TV that is used now for watching the news.
It could have a number of modes: cable/streamed content, display monitor for browsing personal pictures and videos, decoration/wall-paper with favorite photos, and the sleep mode when nobody is in the room.
I could see that with lower TV prices, some people may hang two or three such units on a wall for simultaneous watching of streamed content, and when they are done watching, they turn on the gallery mode with color coordinated pictures.