Here is an article from the Tokyo Anime Fair 2009 with some pictures of Gonzo's stand and of a leaflet. Apparently there will be a new Mahjong-based arcade game with a Saki theme.
(Gonzo's TAF page:
http://www.gonzo.co.jp/taf2009/)
Also, on March 25 volume 5 of the manga will be released (see the
manga HP).