SEGA listed Sonic Mania is its Packaged Games section 👀👀 pic.twitter.com/OvMmyHtODt
— Insert Coin (@hairofthewolf) August 9, 2017
This would be one of many, many examples of Sonic Mania being listed as a retail release. SEGA knows fans want to see that happen. It wouldn't be surprising to see it happen, but there's still nothing official at this time.