It looks like Sonic Frontiers will have DLC, based on this promo

Sega selling add-on content isn't too surprising, but we may have our first soft confirmation of Sonic Frontiers DLC.

Sonic Frontiers' First Free Content Update Is Out This Week And Here's What's In It

First look at Sonic Frontiers add ons : r/SonicTheHedgehog

Sonic Central 2023: Celebrate Sonic's Birthday With New Releases and Updates - Xbox Wire

Sonic Frontiers: Paths Revisited Soundtrack Now Available Featuring Music From The DLC - GamerBraves

Sonic Frontiers for Nintendo Switch - Nintendo Official Site

Sonic Frontiers Free DLC Update 1 is Here & News of the Next Sonic Game OwO

Sonic Frontiers, Sonic Wiki Zone

Make the DLC promo images for your mod Thumbnail. [Sonic Frontiers] [Tutorials]

Sonic News Nintendo Life

PSA: SEGA Warns Sonic Frontiers Digital Deluxe Edition Players To Download The DLC First

Sonic Frontiers Limited release Shoes DLC XBOX (N.A. region)

Sonic Frontiers' free story DLC The Final Horizon is available now: Tales, Amy and Knuckles are playable in the free update : r/XboxSeriesX

Sonic Frontiers Teases Its First DLC and It Is Free