Facebook's announcement seems to have turned into a Schrödinger's Policy which is simultaneously narrow and broad in people's minds.
For instance, there was someone who imagined it might mean Facebook ceasing to be puritanical. There were also people who think Facebook will still be puritanical (I suspect they will still be puritanical).
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It of course could mean that they become less puritanical (for instance, they might instead focus on more important issues), which would be welcome news. Then again, if there is one thing Facebook has been very consistent about over the years, it is the puritanism.
Crucially, Facebook might attempt to justify restrictions on nudity (or other expressions) by conflating them with prostitution.