My guess would be that Apple will drop the price $30-$50, £20-£40 where us Welsh live 😉 ... I dont think that Apple can put much more into the iPod Touches now to be honest, everything's all there, camera, HD display, Facetime, Apps etc.
I haven't bought a 4th gen the same as you because I think the 5th gen will be considerably cheaper when it comes out... Although I could be COMPLETELY wrong and Apple can be Apple and bump the price up $100...
(Also, I've heard the biggest rumour is that Apple are scrapping the home button and making the screen 4" to keep up with the Samsung Galaxy's etc.)