...as per neoGAF, portable old-school role-playing heads stateside July 11.
Interesting to note that Nintendo, not Square-Enix, is the publisher this time around. The ESRB rating is E10+ (DQ VIII on the ps2 was rated "T for Teen," as have most other mainline entries in the Dragon Quest series). Hopefully Nintendo doesn't bungle the transliterations - I'm all for family-friendly games, but this is a game series where the dialogue contributes a great deal to the overall enjoyment of the game, and I'd hate to see a diluted translation of an excellent script just to maintain more accessibility amongst the younger gaming set.
Nintendo's got a pretty impressive teaser up on their official website, FWIW: