This is a cool behind the scenes look at Dexter and the actors, writers and such break down what it will all mean for his sister. If you're not up to speed with the current season, I guess there might be a spoiler in here. If you're all caught up, then I don't know much more than you. Click though:

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Dexter's sister Debra always had mixed feelings for her stepbrother.  Does show love him, or does she LOVE him (yeah it's a little twisted).  Now she's gotten herself tangled in Dexter's dirty work and this once clean cop is now herself a killer. So far all we know about the new season is the Debra appears to be melting down FAST.  Here's a cool behind the scenes look at the new season: