Hiding deep in my RSS aggregator was this little gem:

Essentially, according to an interview in DTM Magazine (01/2009), the newest addition to the Vocaloid line will be bilingual! Yes, it will pull from both an English and Japanese database for it's words making it accessible to both Western and Eastern audiences! Other details include updates to the interface for English use, such as native English input, katakana input, and dual DBs in a single track. [needs verification]

Anyway, time to trowl Japanese book stores until I find a copy of that magazine. Spend Spend Spend!

Edit: Whoops, forgot to cite the Source