During the Apple WorldWide Developers Conference (WWDC), the new iPhone 3GS have been announced.
From the user point of view, not much new. It is faster but the iPhone 3G seams quite fast to me.
From the programmer point of view, it's a big change! The PowerVR MBX have been replaced by the PowerVR SGX which implies the support of OpenGL ES 2.0 instead of OpenGL ES 1.1.
OpenGL ES 2.0 brings a fully programmable approach, a big step, and a lot more fun to program!