I was skeptical of Paris Saint-Germain's rumoured offer for Edinson Cavani, which just goes to show that I'm kind of stupid. PSG are currently the bogeymen in most transfer stories -- they have a lot of money and the willingness to spend it, can offer Champions League football and are not exactly blessed with a surplus of good sense. So when they get involved with something, I tend to assume that their name's been dredged up for the story's sake (just like how Chelsea used to be).
Anyway, I'm stupid. PSG definitely are in for Cavani. That, or Leonardo's a big, fat, liar:
We presented an offer to President Aurelio De Laurentiis that I consider to be very interesting. The negotiations are continuing. We remain in contact and there could be new developments over the next few days.
Source: Il Mattino via Football Italia.
That there are negotiations implies that the club hasn't met the buyout clause but they're close enough to touch it, a step that Chelsea (probably) haven't taken yet. At this point, then, PSG have to be considered the front-runners for Cavani's signature. If he does end up at the Parc des Princes, he'll have to battle with Zlatan Ibrahimovic for playing time, which should be interesting -- a sensible club might relieve them of that decision by making a cheeky bid for Ibra.
Is this going to go through? I don't know, but honestly it wouldn't be the worst thing in the world for the Blues, especially if they're the sensible club mentioned above.