“A friend of mine was telling me that the PS4 was coming out soon. I was just wondering if PS4 games will be playable on the PS3?”
Unfortunately you will not be able to play PS4 games on the PS3. Sony would lose a crap load of money if they made PS4 games playable on the PS3. No one would be buying their fancy new console if they could play current gen games on previous generation console.
But what if Sony made it possible to stream PS4 games on the PS3 using GaiKai (streaming gaming service Sony acquired)? Could they or would they do that?