Haven't seen this around LJs so just thought I'd spread the good news. Expect more news about it within the next few days...
EDIT: The name of the drama is 働くゴン！ (Hataraku Gon!). It is an SP. Official site
EDIT2: Some press releases were apparently made today that confirmed Shintaro being in the drama. This particular one was one I found. Apparently the news was distributed this morning, but was overlooked by most people because Shintaro wasn't headlining the news.
EDIT3: And Tokyograph is carrying the same story too.