Footage apparently taken from an internal Sega briefing suggests that a new Jet Set Radio game is in development.
A short section of the reel - which apparently dates from 2021 - also shows a new Persona game and Sonic Frontiers, the latter of which is now available.
The footage shown is quite short, but certainly looks promising - if it's legit, of course.
Original Jet Set Radio artist Ryuta Ueda returned to Sega in 2021, coincidentally.
Sega fan site Sega Bits has seemingly confirmed that the footage is the real thing:
The first game in the series arrived on the Sega Dreamcast in 2000 and was later ported to the Game Boy Advance. A sequel, Jet Set Radio Future, arrived on the Xbox in 2002.