I'd say Eight Days. But we all know that was never ever anything more than a flashy video for the ps3 unveiling.
Jet Set Radio 2 never happening was disappointing but not unexpected. (Dreamcast was meant to get its own sequel that was different to the Xbox one)
The Dreamcast really had the cancellations I most wanted though. Take the Bullet, Agartha, Arcatera all looked great. CastleVania and Hell Gate too. Propeller Arena was looking awesome too. Eventually code that was fully playable emerged and it was great. However with out on line the main meat of the game was missing.








