Whos could he be? There is an interesting countdown going on the moment at a website. Is it a marketing stunt? Or would they unveil the real Satoshi? In my opinion, it is more like gaining some marketing popularity as their Twitter account has grown up quite massively.
Many people in the history also claimed that they were the satoshi but no one can actually prove them and even real satoshi can't prove it so better keep his anonymity as it and let the bitcoin to be famous all around the world.