Sega has announced a crossover between Cyber Troopers Virtual-On and Dengeki Bunko's A Certain Magical Index light novel series. According to a translation by Gematsu, A Certain Magical Virtual-On (Toaru Majutsu no Virtual-On) is coming to PlayStation 4 and PlayStation Vita in 2018. The title follows a previous crossover light novel of the same title that was release in May 2016.
Everyone seems on board, with A Certain Magical Index author Kazuma Kamachi handling the scripting of the game and Virtual-On series character designer Hajime Katoki doing the mecha designs and other illustrations. The Virtual-On games exist within the fiction of A Certain Magical Index, with the conceit of the light novel and this game being that Index characters will pilot familiar Virtuaroids.
The last release release of a Virtual-On title was Cyber Troopers Virtual-On Marz in 2013 for PlayStation 3. That game itself was a re-release of the earlier PlayStation 2 title. So for hardcore Virtual-On fan, this may represent the only time you'll get to play a modern version of the series.