Gumi is definitely an iconic character, and the new Gumi release is probably as big as the Vocaloid 6 news itself. (Not only are there a lot of "vocaloid classics" that were made with Gumi, but some of the biggest hits in the past few years, such as KING by Kanaria or Getcha by Giga and Kira, have used Gumi.)
I kind of suspect Piapro NT is going to end up being a bust, with a pivot back to Yamaha's platform. We're a few years in and they've still only released Miku, none of the other Crypton Future Media characters, and a lot of people are sticking to the Vocaloid 4 release because they're not fans of how NT sounds. Now V6 is out and the technological gulf is widening.
I kind of suspect Piapro NT is going to end up being a bust, with a pivot back to Yamaha's platform. We're a few years in and they've still only released Miku, none of the other Crypton Future Media characters, and a lot of people are sticking to the Vocaloid 4 release because they're not fans of how NT sounds. Now V6 is out and the technological gulf is widening.