Reply to İpod Touch 5 Generation

Hey guys ;

I am planning to buy myself a ipod touch 8 GB 4 th generation but the problem is there will be a conferance coming up WDCC 2012 by APPLE and ı believe they could give us the new ipod touch 5 th generation or maybe not.I have been scrolling thoruogh websites but none of them give me what ı actually want Tell me guys what shall ı do ? And my other question is : Let s says apple said there will be another ipod touch 5 th generation.When will it be avaible after the conferance ? Like a week , month ? How much time actually takes to be on the market after they reveal ?

Thanx