It's becoming more definitive that Sonic Generations might not just be one of the better titles in the series in recent years, but also the most comprehensive, if we go by the latest trailer.
The theme this time is rivals and bosses, and the quick-run video showcases moments once more that aren't just a nod to classic moments: they're lifted wholesale, suggesting Generations may well play out as a "Best Of" compilation of the series.
Note the speedway fight with Metal Sonic ala Sonic CD, the Chaos fight over a destroyed city that ended Sonic Adventure, and the return of Silver, the white hedgehog that a playable character in Sonic's more recent outings.