It just keeps getting better and better for Unity developers. Those of you who read Nicholas' blog at the main website will be aware that they're 'scrambling like mad' to add support for the iPad by its launch date. Considering the similarities it shares with the iPhone, the transition shouldn't be that tough. It seems that Apple are, understandably, inundated with requests from companies to allow them early access to the device and that this is the only real inhibition facing the Unity devs.
Regarding the new GPU, there's not much sensible information out there currently other than that the chip itself seems to be a multi-purpose solution to the systems architecture. The main processor is an ARM Cortex-A9 and the GPU is an ARM Mali GPU. The CPU and GPU are all on the same chip, running at 1GHz in comparison to the iPhone 3GS which runs at 0.6GHz. Finding information on the GPU is tough, though the manufacturer's website states it supports 4x and 16x full scene anti-aliasing (should you need it).
Of importance to note here is that this is another opportunity to make some money. Creating apps for the iPhone, which sell, has become significantly more difficult due to how much content there already is in the store. While the iPad will supposedly support all the current iPhone apps, the new SDK ensures that there'll be loads of new stuff. The faster GPU also means that we will have fewer constraints to deal with when optimizing content for the device and more opportunities to impress users with visuals. The future is looking very promising with new markets and a growing industry, exciting times indeed.