Should i buy the ps3 or the ps4 when it comes out?

i had the ps3 i sold it now im thinking to buy it again but ps4 is also cooming out in holiday 2013 but the problem is that i cant afford it so what do you guys think should i buy it or not?i wanna buy it i wanna play the new coming up titles for example the last of us,gta 5 etc
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