The improvement will be that it will load faster. Bluray picture quality will be the same as any high end bluray player, Oppo, Marrantz, Denon, etc. Up scaling of DVD's it's what differs from one player to another. Also as for having IR, I believe it will be Bluetooth like the PS3. But in reality all we can do is speculate for now until it comes out and really test it. I for one, will be getting the PS4 for sure, that's why I have been waiting out since last year. I was going to get the Oppo 103 or Panasonic 500 but decided to wait. My PS3 still serves me well anyways.
Media room- LG 4K OLED EG9600, Pioneer Elite VSX-90, Samsung 4K K8500, Klipsch Gallery G28's, Klipsch Sub 12, Klipsch RS-52 II, Optik HD cable
Living room- Sony 4K 79XBRX900B, Onkyo RC-360,HTPC, Klipsch Reference R-62II, Rc52II,PS4
Gaming room -Panasonic ST60, PS3, Wii