Source: Tomodachi 100
According to this blog, the last chapter had a special page dedicated to the FT Anime, and it confirmed the Anime will continue into the Grand Magic Games Arc, starting on October! As for the new characters' VA:
Sting - Takahiro Sakurai Rogue - Ken'ichi Suzumura Lector - Akiko Yajima Frosch - Satomi Koorogi