Monthly Comic ZERO-SUM magazine announced today on their Twitter that there will be a Tiger & Bunny manga anthology. The manga anthology will have cover art drawn by Touya Mikanagi whose manga Karneval is currently being serialized in Comic ZERO-SUM. The expected street date for the anthology is August 25th.
It will be published by Ichijinsha which is also publishing the Tiger & Bunny Official Hero Book set to be released on July 25th. (Ichijinsha is also the publisher of Monthly Comic ZERO-SUM magazine.)
Update: I checked Ichijinsha’s main site and ZERO-SUM site, but I couldn’t find any further information on the anthology yet. I’m hoping the artist list will be announced soon so we’ll know what to expect.