User blog comment:IStoleOumasPanta/My Hopes For VOCALOID5/@comment-34106721-20180810013835/@comment-53539-20180810083901

Gackpo's been said he might get English, however, one big factor is the cost of recording and Gackt needs to be in a studio for about 1 week at least. In total he had two days top for his original V2 vocal, and likely again for the two new vocals in V3. ITs super expensive to keep Gackt in the studio for a long time due to being a high professional vocal and this is the biggest factor in Gackpo English and why its not likely happened. Same sort of situation for Lily I guess too. Gumi English also didn't fully sell so well and has yet to be updated, Gumi was the trial run for seeing if English should be considered for Internet co vocaloids.

I said that was a bad move as English CeVIO is new and Ia English is their only English vocal right now. And so far judging by how hardly used it is... I may just be right. But due to the fact its on CeVIO now, its unlikely to come to Vocaloid.

Piko V5 ain't likely to happen at all, you know this as you said so yourself elsewhere. The list of problems for him goes on.

Ah Software is interested in English vocals, but none of their providers can speak English, save Nana's. They said they'd rather create entirely new vocals then do the Crypton approach, which I think is sensible. Nana's English vocal pretty much did hint they are now moving to do English vocals as right as at the end of V4 the XSY group "AHS English" appeared with both V3 and V4 Nana vocals in it. I think, however, the retirement of XSY in V5 is a bit sad in regards to this as it meant AHS would have had the largest English XSY group when it happened and the only time we really would have gotten to play with XSY for English in legit Vocaloid.