From the front page of the new york times:
"A federal law enforcement official said he would not be read his Miranda rights, because the authorities would be invoking the public safety exception in order to question him extensively about other potential explosive devices or accomplices and to try to gain intelligence."
At which point, the Courts will say "you dun fucked up Police", and the self-incriminating evidence will be inadmissible to court, and not allowed to be told to the jury.
And the police will win the case _anyway_ because we got so much evidence on this guy they can win the case in their sleep. So it all won't matter in the long run.
Thats the good thing about the courts. The Police don't decide whether or not they're exercising the Public Safety Exception... the courts do.
http://www.nytimes.com/2013/04/20/us/boston-marathon-bombing...