Was that the hack n' slash lined up on the side of the Sega theater?
If it was - yes, I played it - and it was pretty good. Nothing revolutionary or anything like that, but it was a fun game. The character designs were cool, and the difficulty felt just right to me as I got in the caves later on in the demo.
Spells were pretty cool looking as well - my only complaint was the graphics looked a little fuzzy - but that could have been the monitors they were running on.
When this come out anyway?
BTW - Sega kicked ass at E3 this year imo.