It’s not 100% official but next iPod Touch Generation 4 or iPod Touch 4.0 will have Camera on the back. Checkout the image below! It is a iPod Touch 4.0 Apple Development iPod Touch which was originally displayed for sale on Ebay! Yeah, No kidding! Somebody is selling Development iPod Touch 4.0 on Ebay!
Well if you want to see it on ebay , or maybe even bid on it, go to this Ebay link.
Also thanks to 9to5Mac for news and photos.