Dragon Quest IX may be out, but that doesn't mean Square Enix isn't done with DQ games.
At this year's TGS, there will be two Dragon Quest titles on display: Dragon Quest VI and Dragon Quest III. Both titles will have trailers and playable demos as well.
Dragon Quest VI was originally released in Japan on the Super Nintendo in 1995 and DQIII was released in 1988 in Japan on the Nintendo Entertainment System.
The DQVI remake is coming to the Nintendo DS, and the DQIII remake is coming to Japanese cell phones. Both are TBA.