That's what Dragon Quest Koichi Sugiyama is shooting for. At a recent Dragon Quest III concert in Japan, Sugiyama said, "I'm aiming for next year and am in the middle of composing music for Dragon Quest."
Sugiyama said he is working hard to get it finished by next year—and it sounds more like he was referring to the music than the game itself (his comment is unclear!). Dragon Quest Yuji Horii previously said that Square Enix would reveal more about DQX sometime this year.
When Dragon Quest X does launch, it most likely will be one of the last major titles to hit the Wii before the Wii successor launches.