Gunvolt 2 is getting a new update that will be adding in a new mode called ‘Japanese Voice Mode’, which not only restores voice acting from the game’s Japanese release but also re-localizes the entire game to match the original JP voice actors. This update is releasing October 20th for the Nintendo 3DS for both the retail bundle containing Gunvolt 1 & 2 alongside the E-Shop release of Gunvolt 2.

Well Gunvolters, the time has finally come! A year ago, after releasing the Steam version of Azure Striker Gunvolt with the Japanese Voice Mode addition, something that many of you asked for, I personally made it a mission to do whatever we could to make sure that our 3DS Gunvolt players got this feature too.
I’m sorry that it’s taken a year for us to deliver on this promise. But, I’m very happy to announce that a Version 1.3 patch that will add Japanese Voice Mode to the Nintendo 3DS version (digital download) of Azure Striker Gunvolt will release on the Nintendo 3DS eShop on Thursday October 20th! For those of you who are not familiar with Japanese Voice Mode, this was a mode that we created for Azure Striker Gunvolt 1 that adds in content that was regrettably removed from the initial release of the 3DS version of the game. Not only does this patch restore the voices to each and every one of the characters, but the entire game has been re-localized to better match with the addition of these voices. This mode also restores ample amounts of dialogue that was previously removed from the game that takes place as Gunvolt traverses each stage.
This mode gives a much deeper insight into who the characters are and why they are doing what they do, so I hope that you not just enjoy the Japanese Voice Mode addition, but that you develop a newfound appreciation for these fantastic characters.

Source: Nintendo Everything via Inti-Creates Press Release