Bread and Circuses
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To answer your question, the "files" weren't released yet, per se. The EO was signed to declassify the JFK and MLK files.
That being said, almost all JFK files have already been released and are publicly available online, some in the 90s and the rest in 2017 and 2018 (per the 1992 order). Further, the files are 50 years old now which is a default declassification date for most classified documents.
I guess the EO is focused on any remaining redacted sections that have been "in review" since 2017 or so by Agencies.
Again, the files have been available for many years.
I doubt any remaining redacted stuff will be game changing, but I guess we'll see. There are still folks who think JFK Jr is returning and that we never landed on the moon so my confidence that we can handle information intelligently is low.