Hatsune Miku
Since the success of her Vocaloid 2 package led to an expansion of marketing possibilities, most of the mass marketing has come after her initial release as a response to her popularity and has been on going since 2008. Even with the addition of other Character Vocals, Miku's name continues to be used as the primary source of marketing for Crypton Future Media, to the point where most products for their Vocaloid related products will usually only feature Hatsune Miku's name. In March 2012, the Nomura Research Institute estimated that the sales of all Hatsune Miku brand goods added up into the region of since her release in 2007. Her name is easily the most recognizable of all Vocaloids.
Hatsune Miku
It was mentioned that a 7th "Append" voicebank, a falsetto voice, had been recorded; however, since the developers didn't think it would be useful on its own, no plans were made for an independent release. During the Kagamine Append development, a "darkish Whisper/Sweet" append was being considered. Miku's English vocal was also due for a Vocaloid 2 release, but it was not released in the engine due to low quality.