As the DiGRA Japan team just announced, they have just released the full program for DiGRA 2007 conference. Quickly glancing through, the very first impression: looks promising! Take a look at: http://www.digra2007.jp/Program.html.
Edit: The second look: there seems to be some timing conflicts in this version, though. E.g. in Friday at 16:30 one is forced to choose between MMORPG symposium and the panel session of RPGs (“Character, Player, Game”). The audience for both is pretty much the same, though. There are overlaps also in game design research presentations (Aki Järvinen and Jesper Juul having their sessions at the same time in Saturday), but I suppose it is impossible to avoid totally such overlaps in a conference that is so tightly focused on game studies as DiGRA conferences are. Hope there will be some finetuning of the program yet, though.