Well, as I stated in a previous thread, I think the CONS of the PlayStation (Orbis) will far outweigh the PROS.
It will not have backwards compatibility. For the future, it seems that most games from the previous generation system will end up being downloadable content on the PlayStation Network store. This is an iteration we already see with DLC for the Final Fantasy PlayStation One games, and PSP High Definition releases. This will be an official means of playing much of the PS3 games on the PlayStation 4.
Sony has also taken an extra effort against piracy by locking PlayStation games to a single console, through online verification and downloadable content. The console must always be online to play your games. Furthermore, any Disc based game will be locked to your PlayStation 4 (Orbis) once it has been scanned. This means your friend cannot, take your PS4 disc and play it on his PlayStation 4. PlayStation wants a definite pipeline to maximize profit, by forcing customers to buy new/unused copies of the game. This goes without saying that rental companies like Gamefly, EB Games & Game Spot are going to feel the fire. Luckily it is rumored that Xbox 720 will NOT be taking this approach of locking games to a system in order to combat piracy.
This is why I believe Xbox will ultimately be the system of choice for most gamers, if they cannot afford a PC.
These will be the new features that I do not take kindly to.
Now, as far as 3D- I believe there was mention that the PlayStation 4 will have 3D capability in games. Windows 8 supports resolutions of 3840 x 2560 to photographers, video producers and marketing professionals. By today's standards that scale of definition is unbelievable. However, the PlayStation Orbis will support resolutions of 4096 x 2304 - up from 1080p. The cameras of current movie producers do NOT film at that current definition. Cameras of that resolution have just recently hit the market. All this is to say, PS4 will have 3D capabilities.