I watched the PS4 reveal recently too, and I felt the same way. I think there is typically an established line between derivative and re-hashed ideas, and sometimes I don't mind when something isn't fully realized & fine-tuned as long as there is a strong concept and the developer & publisher have the balls to take a risk.
This is how I felt about Mirror's Edge; I was enthralled by its evolution of platforming principles, and it actually had an immersive quality that got your heart pumping as you jumped across roof tops, and took death-defying leaps off of buildings to grab a pipe 40 feet below.
Maybe it's nostalgia, but the leap between Super Mario Bros and Super Mario World, or The Legend of Zelda to A Link To The Past seemed/seems absolutely massive - a true expansion of an IP in a way that both enhanced creativity and refined what already worked. Perhaps because of the increasing cost of development, studios just don't fine-tune titles as much, and that way that publishers breathe down a studio's neck doesn't allow for much "what if" concept development time.
And if I hear the term "Playstation Ecosystem" one more time, I'm going to Silvia Plath myself...