N1 is sexier than the concept I think.
Most likely HTC will release their own version of the N1 which will likely have either Sense UI or their new Espresso UI. The specs will most likely stay the same if the Hero and Magic 32A is any indication. Cosmetic features will most likely change as well, but no matter what may happen the HTC Experience version will definatly not have the same cosmetic features as the concept.
I have also read that Google is planning on making a budget version of the N1, which makes me think perhaps it will be similar to the Magic 32B /MT3G was to Magic 32A?