[First amendment has nothing to do with this. The first amendment protects from criminal government prosecution, not reactions from private individuals/entities.
I'm glad someone posted this before I did. This most definitely has zilch to do with Amendment #1. I'll bet money that any of Sony's documents and emails had all sorts of disclaimers added to them. It's those disclaimers that Sony will use to sue press organizations into oblivion if they dare print any of it.
While I'm no fan of Sony, I don't really see this ending well for the press.