User blog comment:Sampop12/Kaito V4/@comment-28951715-20160831124226/@comment-53539-20160831131537

3 years isn't that long. Take for example unity-chan, in 5 years her voicers voal hasn't developed enough to warrant them considering an update. This is why they said they would wait 5 years.

3 years is still too soon.

Also even if the update occurs, it could be released for V5.