Yeah if it's full backwards compatible, legit can just put in any PS4 game in and even better if they can keep the saves through cloud save support(I don't want to lose all my Monster Hunter World work), it's likely a Day 1 buy too, even better if it goes older systems too. I'm watching the show if they tease anything. I don't think it'll be a full reveal, like Xbox was, but we'll see.
Jesus, they only teased the logo, which is exactly the same as the PS4 and PS3 lol I'm curious if they'll wait till E3 to show it off. The least they could've done was show the system design lol