KLXVER said:
Looks kinda slow imo. Maybe they just played on an easier setting?

If I'm remembering Sonic & All-Stars Racing Transformed (the last Sonic kart game by Sumo) correctly, it had multiple difficulty classes with different speeds, same as Mario Kart. Safe to assume this is gameplay of the slowest difficulty tier, it's early press gameplay of the demo that will be playable at E3, and E3 demos are always on the lowest difficulty setting since alot of casuals attend E3.