Yurikamome Line
The Yurikamome line (a monorail that goes from Shinbashi to Ariake, stopping by Big Sight - where the Comiket is held - on the way) will have voice announcements by seiyuus when the line is extended to Toyosu. Information about who will be doing announcements for which station is shown here. Information will be updated weekly, with 2 seiyuus added each week.
I love living in Tokyo ^^