If you don't plan on picking up the PlayStation 4 this year, you'll probably end up getting some of those cross-gen titles for the PS3.
Games like Assassin's Creed IV: Black Flag , Watch Dogs , Call of Duty: Ghosts and Battlefield 4 will be available on both the PS3 and PS4. And Sony has now revealed an upgrade program.
Basically, if you buy the PS3 version of one of those games, and then get the digital iteration for the PS4 at a later date, you will receive the latter version at a "significantly discounted price." Many of the major publishers are participating in this program; right now, Electronic Arts, Activision, Ubisoft and Warner Bros. have all signed up to take part. By the way, retailers such as Amazon and GameStop have similar promotions that let gamers trade up to the next-gen version for only $10. I say, just get a new system ASAP. 😉
We're not sure if this program will be available worldwide.