I mainly get the Playstation for the Metal Gear Soild and the Killzone games and few other tiles.

I will getting the ps4 and I do know they will be having a lot of old ps1-3 on the cloud/I forgot the other one they will add the old games.
I do understand why it isn't backward compability. To me there is no real point of having it. The games on ps4 will still be on the ps3. Nothing will really change. They pretty much have the same graphics