I think whoever said a deal had already been negotiated was probably right- but it's still fantastic news!!!!
I think you are right too. Heck, it may have even been the suggestion of the No. Koreans - as in, "Hey, we'll pardon those journalist/spies, if you guys send over a top level diplomat to help us 'save face'. Like, maybe an ex-President, or so, and everyone will walk away happy."