Meanwhile iFixit has disassembled the iMac completely and provided their usual detailed gallery.
Primate Labs has already posted some benchmarks of the new iMacs and Mac minis. Unsurprisingly they found that processor speed has not improved significantly between the older and the new modelsrocessor performance hasnt increased substantially in the latest hardware; the performance increase seems to scale with processor speed. This isnt surprising, since neither the iMac nor the Mac mini moved to a new processor architecture.Geekbench, however, only measures processor and memory performance and does not measure graphics card performance. The main improvement in these models was a move to an NVIDIA-based architecture with improved integrated graphics. This should improve graphics benchmarks and will also provide additional benefits when Snow Leopard is released.
Article Link: Unboxing of the Early 2009 NVIDIA iMac, Early Benchmarks