Here is some Heroes-related cancellation news that shouldn't be all too surprising with the way the ratings have been looking this season:
With the news that star Sendhil Ramamurthy (Mohinder) has been cast in an NBC pilot for next Fall, the future of the series as a whole has again been thrown into question. One of the lead actors in the show taking a new pilot cannot be a good sign, right?
NBC reminds us that "Rex is just a pilot right now, so [Sendhil] is still on Heroes. Rex is in second position to Heroes." This means that should both his pilot get picked up and Heroes were to get another season, he would still be attached to Heroes. But - since his pilot is also an NBC show - you can kind of see just how much faith the network has in Heroes' survival. NBC probably wouldn't cast Ramamurthy in a pilot unless they seem to think he'll be needing a new show to appear in next Fall, right?
Furthermore, says a source on the show, "Everyone is expecting this to be the last season. The cast, the crew, everyone."
So there you have it.