My initial impression of the Nexus S hardware is that it looks a whole lot like the Samsung Galaxy line of Android phones. There are a few differences, however. The display is slightly curved (which Google and Samsung are calling a "Contour Display), but it seems more like a gimmick than an actual useful feature. Unlike the Galaxy phones, the Nexus S does not have a microSD slot; you're limited to only 16GB of storage. It also doesn't have a dedicated camera key, which might not be a big deal for some people. As somebody who is constantly taking pictures with her phone, I sorely missed the shutter key.
The will be available unlocked or with a T-Mobile service plan and can be purchased online and in-store from Best Buy starting after December 16. Stay tuned for a full rated review tomorrow.