Overview
Between Vice City's nightclub scene and Leonida's heavy Latin influence, a Latin and dance station is an easy prediction. The original Vice City had Radio Espantoso for mambo, salsa, and Latin jazz, and a modern equivalent leaning into reggaeton, Latin pop, and club electronic would suit the present-day setting.
"Leonida Nights" is a fan placeholder name used here for clarity. Rockstar has not announced a Latin or dance station, branding, or host.
What we actually know
Confirmed: nothing specific. The expectation is grounded in the setting and in the series' history of a Latin station, but no GTA VI station of this type has been shown or named.
Trivia
A club-and-Latin station would naturally soundtrack the nightlife districts seen in trailers, which is why fans so often pencil it in even without any direct evidence.