I fully expect the conspiracy talk to start gearing up considerably as a result of this. After it was revealved that Dzhokar Tsarnaev's mother was apparently recorded by the Russians discussing jihad with his brother, people are now assuming she is some sort of anti-American jihadist and is wrapped up in the bombings (read any of the comments on the Yahoo! news stories about the bombings if you dare). Add to that the fact that she is grieving for her dead son and her imprisoned son and, like many a parent, doesn't think her children would ever do anything like this and you have more "evidence" that she's a lying bitch who hates America who somehow knew about this plot all along. I've heard that the dad apparently wears sunglasses because he's hiding something - I assumed he was hiding the fact that he's probably been crying a whole lot.
Three new suspects will really add fuel to the fire. What will be interesting is to see how these fit into the 'false flag' and 'Boston was an inside job' narratives. More patsies I suppose?