***SPOILER ALERT*** Supernatural.. Where does it go from here?

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So, now we know that Sam was indeed dead, and that Dean traded his soul to get him back. Dean made the deal with the demon to have only one year, instead of the usual ten that is normally allowed, as we saw on the previous Crossroads episode. Dean was supposed to die a year ago, but his father traded his soul so that his son would live. I was glad to see that even though many demons escaped the gates of hell, so did John Winchester. Sam and Dean both wondered if their father's escape meant that he was able to make it to Heaven. Now, we are left hanging, wondering if Sam will be able to live up to his promise to find a way out of Dean's impending trip down the highway to hell. As the demon said, if Dean tries to back out or find a way around it, Sam will drop dead again. Do you think that Sam and Dean will be able to figure out a way to stop this without either of them dying? Before yellow eyes died, he told Dean that the deal he made could have meant that when Sam was resurrected, something ELSE could have come along for the ride. Do you think this is true? I do admit that I was shocked at Sam's ability to kill the soldier without batting an eye. Sam has never been able to bring himself to kill anyone, his heart wouldn't let him, yet he was able to kill this time without remorse. I think that perhaps the death and resurrection via evil means meant the end of the "purity of heart" that defined Sam. Do any of you have any plot predictions? I'm anxious to hear opinions and predictions!