MMOFPS games can be played online on the MMOBOMB website. There is an extensive list of free games available to be downloaded or played in your browser.
You can buy a PS4 at any good games retailer both in stores and online
In short, no. Sony haven't released any information regarding a PS4 yet, so we can only assume that you cannot. It is highly likely you will be able to play PS3 games on it, that is - if it really comes out.
That's hard to say, especially with the lack of mmofps games. Probably Combat Arms.
Assaultcube IMO.
No you will not be able to play the games either way. Systems changes on the PS4 allow them more design capability for games and many titles will be released in a downgraded PS3 version. You still will have to have a PS4 to play PS4 games and a PS3 to play PS3 games.
You can order one from Target walmart gamestop amazon Sony USA and the preorder will be $399 for the basic PS4 console without any games
No, the PS4 does not have backward capability and cannot activate (play) PS3 or PS2 games.
Major Multiplayer Online First Person Shooter
There is no PS4 or any information on it's release. It is very unlikely that Sony will use the name again on it's next model of console. When they are going to release it the consoles will go out to game developers to allow the games to be developed. There are no reports of any PS4 being at any game developers
No, the PS4 will only run the games made for the system. But there is a application on PS4 called PlayStation Now which will allow you to play PS3/PS2 games for a price.
No. Steam games run on PC/mac and not on Sony PS4 (or nintendo or xbox) at all.