The following comes from a USGamer interview with Inti Creates CEO Takuya Aizu...
On trying to make a physical version of Azure Striker Gunvolt: Striker Pack happen for Switch
"We have a physical version confirmed for Japan. It's going digital for America. We're looking to work with different publishers to get a physical release for America and Europe, but at the moment nothing is set."
On Mighty Gunvolt Burst's character customization
"One of the other things that's been completely reformed from the original Mighty No. 9 is a deep character customization system. As you complete the game, you'll collect chip modules that you can use to unlock new customization options. You might be able to modify the arc of your shot or get an additional bullet on screen, or be able to change your outfit's color. So all these elements really set it apart from the other game.
There are two major ways to get these. First of all, many of them are hidden throughout the stages. In fact, there's an ability you can use in the Switch version called dowsing — when you get close to a hidden item you'll feel the HD rumble kick in. Maybe there's a hidden wall or something that you have to destroy that contains hidden modules. And then, when you defeat bosses, you can select one of many rare drop items."
On bringing in Gun*Gal's Ekoro as a playable character later
"For playable characters, this time around you're starting off with two, Beck and Gunvolt. As you mentioned, there were three characters in the original. So, as for Ekoro [from Gal*Gun], we're actually working on her right now, and the plan is that... when the game comes out, you can absolutely play as Beck and Gunvolt. After that, we'll be adding Ekoro to the game as soon as we possibly can. And we have many more characters to come."
On Inafune not being involved with Mighty Gunvolt Burst
"We made this game completely on our own, with no input from Keiji Inafune or Comcept. Basically, we said, 'We want to use these characters,' and they said, 'Go ahead!' We were happy that they gave us the OK to use these characters, for free. But in terms of the game itself, there's no involvement from Concept. This is a labor of love by Inti Creates with characters we really adore."