Two demos were presented. One of them consisted in demonstrating, with a video of a Saturn RPG (Panzer Dragon Saga?), that the drive could handle multimedia playback. The second one presented the saving and loading on a zip.
I’ve seen this demo video before, but didn’t realise it was made to demonstrate the Zip Drive. As far as I know, this was the extent of the demo, e.g. Sega never intended to put the game on Dreamcast.