It's from good ol' 4chan so take it with a grain of salt, but an anonymous poster made this claim alongside what appears to be a new promotional render:
While the image looks very convincing and doesn't seem to be from any existing art (the Japanese text just says "30th anniversary collection" for anyone wondering), it's worth noting that Sonic has insanely dedicated fans who can and have put out renders of this sort of quality before, so it could very well be a hoax. Still, a collection for the 30th anniversary is a bit of a no-brainer, and the panel at SXSW is exactly the sort of place to do it - in previous years they've announced Team Sonic Racing and the Encore Mode DLC for Sonic Mania at the event.
Sega's preparing for a big Sonic reveal at SXSW that will bring most of the 3D mainline Sonic games to current and next gen consoles. See you at SXSW.
While the image looks very convincing and doesn't seem to be from any existing art (the Japanese text just says "30th anniversary collection" for anyone wondering), it's worth noting that Sonic has insanely dedicated fans who can and have put out renders of this sort of quality before, so it could very well be a hoax. Still, a collection for the 30th anniversary is a bit of a no-brainer, and the panel at SXSW is exactly the sort of place to do it - in previous years they've announced Team Sonic Racing and the Encore Mode DLC for Sonic Mania at the event.