Could Professor Layton and the Miracle Mask be seeing a North American debut? While the 3DS title has thus far been confirmed for Europe (and already is a big hit in Japan), Nintendo of America has thus far pled the fifth on stateside release. However, the sleuths at Siliconera have just found a trademark filing for the U.S., likely leading up to announcement at E3.
As they go on to point out, this seems to be Level 5's modus operandi; the last two Professor Layton titles (the Last Specter and the Unwound Future) were similarly revealed at E3 after a trademark filing mere weeks before the event. Who knows, maybe we'll get real lucky and this time next year, it'll be Professor Layton vs. Ace Attorney.