Board Thread:Sonic News and Updates/@comment-2054358-20140310221503/@comment-25061880-20160126160846

I'm pretty sure they will keep Colleen as Charmy. There have been a lot of voice actors who voiced two characters such as Griffith did Sonic and Shadow.

If you look at this page, Kate Higgins is still written down as the voice actor of Tails. They might reuse the voice clips of her like they did before with several characters in the Mario & Sonic games.