There was some news from the set a couple of weeks ago that gave away something important that is going to be happening sometime this season.
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There was an accident on the set and Jimmy Smits accidentally stabbed a stunt man with a real knife, rather than a prop knife.
According to the story, the stunt man was bound and gagged similar to how Dexter usually prepares his victims, and Smits picked up a real knife rather than the prop knife and stabbed the actor in the chest. Luckily, the stunt man was wearing a protective shield over his heart, so it didn't kill him. Because he was bound up, the stunt man was unable to stop Smits. Michael C. Hall realized that Smits had picked up the wrong knife, but was unable to warn him in time.
Unless it's some sort of dream sequence, it would appear that Smits will be getting a little closer to Dexter's world sometime this season.
The accident happened two and a half weeks ago, so it'll probably be close to the end of the season when that particular episode airs.
Here's the story (possibly possible spoilers):
http://www.tv.com/story/11691.html