It doesn't matter if Grand Theft Auto V
is coming out. Grand Theft Auto IV
is also certainly worth playing. Besides, the usual price for it isn't that high anymore, so it's not as if you'd be paying sixty dollars for Grand Theft Auto IV
Also, there's such thing as Episodes from Liberty City
, which is the pair of DLC games that came out as part of the IV era. You might want to look into that, too.
I hope this helps!