The latest video looks at upcoming HD ports of NiGHTS into DREAMS, Sonic Adventure 2 and Jet Set Radio.
The trailer focuses on each title's visual improvements, as well as the bonus features that will be included with the PSN, XBLA and PC releases.
The remakes include improved HD visuals and a 16:9 aspect ratio, as well as online leaderboards, bonus interviews and support for achievements and trophies.
Sega has increasingly been dipping into its Dreamcast library to produce HD ports for Xbox Live Arcade, PlayStation Network and PC. Past HD releases have included Sonic Adventure, Crazy Taxi, Space Channel 5: Part 2 and Sega Bass Fishing.
The publisher has hinted that ports of Shenmue and Skies of Arcadia could be on the way in the future.
NiGHTS into DREAMS HD, which is the publisher's first HD remake of a Sega Saturn title, will be released in October, alongside Sonic Adventure 2.
Jet Set Radio HD, meanwhile, releases later this month.