One of the major points taken from the Xbox One reveal is how the console will handle used games. Although conflicting stories have surfaced, the most prominent rumor is that a user who attempts to play a used disc will have to pay a "fee". This "fee" may or may not be equal to the retail price of the game. If this is true, it will likely be the same on the PS4 as well. Here's why I believe it:
1) If this "fee" applies only to MS published games, it would be far less of an issue than it's being reported as. After all, exclusive games account for less than 10% of total games this generation - next generation will likely be even less.
2) If the "fee" is for all (or most) games (including third party games), it will almost certainly be applied to PS4 games as well. After all, if Activision, EA (or any other publisher) is going to collect a "fee" anytime an Xbox One user installs a pre-owned game, what reason would they have for allowing a PS4 owner to play the exact same used game for free? While some may make the argument that MS makes people pay for what's free elsewhere (Xbox Live), the used game fee would be a publisher revenue, not MS. This would be an entirely different model than Xbox Live, as publishers don't get any of the Xbox Live subscription money.
Who would collect the used game "fee"? If it's an EA game, it's obvious that EA would. After all, they could argue that it's their lost sale. Used game fees for third party games can't be considered an MS revenue stream, because MS would have no claim to attempt to collect a fee for a game that they didn't publish.
Used game fees are clearly publisher driven, as MS or Sony would have little to gain from them (unless the game in question is one of their own exclusives). Therefore, it's only logical that the exact same games will have the exact same policies regardless of what platform they are played on.
There's simply no reason to collect a used game fee on one console but not on another. Any publisher who does that will potentially be sabotaging themselves, as well as the console maker.
Sony has already announced that the PS4 will not block used games, but the fee model would allow that statement to remain true. Unfortunately, it's looking like next generation will be a lot more expensive for consumers.