Guys,

I got this information from one of the blog. So here are the specs of the new iPhone 4G:

* Front-facing video chat camera
* Improved regular back-camera (the lens is quite noticeably larger than the iPhone 3GS)
* Camera flash
* Micro-SIM instead of standard SIM (like the iPad)
* Improved display.
* Secondary mic for noise cancellation, at the top, next to the headphone jack
* Split buttons for volume
* Power, mute, and volume buttons are all metallic

And some changed things:

* The back is entirely flat, made of either glass or ceramic or shiny plastic
* An aluminum border going completely around the outside
* Slightly smaller screen than the 3GS (but seemingly higher resolution)
* Everything is more squared off
* 3 grams heavier
* 16% Larger battery
* Internals components are shrunken, miniaturized and reduced to make room for the larger battery

For more information, please refer to http://techcrunch.com/2010/04/19/iphone-hd-4g/

Im not sure.... based on my conversation with Apple's representative... may be next year or later... Now they are on midst of releasing iPhone OS 4.0