His name is Kūgo Ginjō but anything else about him hasn't been revealed yet other than what was shown in the recent chapters. He has two comrades named Riruka and Giriko Kutsuzawa and the three have some hidden motives. He somehow knows about Urahara's shop and has an interest in Isshin, claiming that Ichigo does not know much about his family. The upcoming chapters will likely reveal more, so keep reading.