I'll guess it's related to his Joannides theory. That is Oswald was an unwitting participant in some counter intelligence operation intended to embarrass the FPCC. Or maybe AMSPELL, the CIA/DRE relationship. Hes' been pushing this story for years.
As to its significance I'll just be skeptical since he has a history, for me, of exaggerating things. Particularly since he said this, "The CIA is hiding something terribly embarassing..." Is hiding something? He knows this?
Given the way Morley is hyping tomorrow's event, I hope it's as significant as he is advertising.
I agree that it's probably related to the FPCC and/or Mexico City.
And if it's true that the CIA had a relationship with Oswald prior to the Kennedy assassination, that's something that would help explain their continued secrecy around the 1963 files of agents like Joannides who died decades ago.
However, it may fall short of a Smoking Gun proving that JFK's murder was an Inside Job. But that may not matter because if it's confirmed that Oswald had a relationship with the CIA or FBI or both agencies, that would only increase the speculation that it was an Inside Job.