There's a rumour doing the rounds that Diaz has asked for a certain amount of money for the fight, the UFC have said no and Diaz has said he won't fight. Conor wants to fight Diaz so is refusing to fight also.
Diaz also tweeted something along the same lines as Conor, but it's a bit hard to tell if he's just trying to wind Conor up, or they're both in this together. All very cryptic at the moment.
Either way I bet Dana is sweating right now, when do the UFC 200 tickets go on sale? Couple of weeks? He won't be happy
Oh, and I discovered this on the UG in a discussion about Conor - LOL at Rashad, Khabib and Rogan