Previously announced returning cast members include: Shun Oguri (Lupin III, Hana Yori Dango) as Gintoki Sakata, Masaki Suda (Kamen Rider W) as Shinpachi Shimura, Kanna Hashimoto (live-action Assassination Classroom) as Kagura, Masami Nagasawa (From Up on Poppy Hill) as Tae Shimura, Masaki Okada (JoJo's Bizarre Adventure: Diamond Is Unbreakable Chapter I) as Kotaro Katsura, and Elizabeth. In addition, Jiro Sato (Hero Yoshihiko) will also return in the sequel, but he'll be playing a different role.
Written and directed by Yuichi Fukuda (Hero Yoshihiko), Gintama 2 (Tentative) is set to premiere on August 17th in Japan.
[Source: Anime News Network (link 2)]