Rooting for Cormier, but in my opinion to win the fight he'll have to show things that he's never shown before. It's usually not a good idea to count on that happening.
Everyone knows the first issue with Jones is range. To get close, you must get past the kicks. Unfortunately, Cormier has never been one to catch or counter kicks. He usually just steps back and resets when guys try to kick at him. Against Jones, that's as good as agreeing to hope for a decision loss. Even worse, as we saw against Glover (who actually did an amazing job shutting down Jones' kicks in the first two rounds), Jones learned how to jab and is willing to mix in head-snapping jabs with his hand fighting and eye poking. So not only will Cormier need to have developed an answer for those kicks, he'll have to simultaneously be able to get past that jab.
The good news on that front is that Glover did have success when he got in the pocket...until Jones went all the way in and beat him up on the inside. A lot of that had to do with Glover's complete lack of a jab. He's all power shots once he thinks he can reach, so it was easy for Jones to get inside on him without taking damage or being forced to stand in that critical distance for too long. Cormier does have the jab to do that, which gives him an infinitely better chance at forcing exchanges provided he can get past the legs.
Even if Cormier can do that though, how consistently can he do it? The second biggest issue with Jones is that he's an attrition based fighter. Disregarding huge mismatches like the Sonnen fight, he isn't extremely dangerous until he's worn you down. He doesn't have huge power. He only hurts guys with one shot when it's something like a spinning elbow that they didn't see. But, he's very active targeting the body and legs. No one looks good in the last two rounds against Jones. If their body isn't failing them, their mind is. Do I think Cormier will break mentally? No. However, I'm very worried that he'll get worn down. Even if he can produce some big moments early, will he be able to either finish Jones or continue to produce them as the fight wears on? No one so far has been able to.
The good news is I highly doubt Jones will have an advantage on the inside. A lot of his work with his elbows and clinch entries can be shut down just by a good jab like Cormier's. And once he's in the clinch, Cormier is constantly fighting for head position, pushing guys against the cage or tossing them. I believe his clinch game will be stronger than ever, certainly better than anyone Jones has fought. That gives him the best chance (besides Gus) to work his boxing.
Cormier has been talking about taking Jones to deep water and drowning him. That's interesting because it's what Jones does too. The key question is if Cormier can deal with the range in a way that will let him implement that strategy. Most Jones opponents drop their output significantly against him. Assuming he does have the mentality to keep pushing that hard, he's also gonna need the technical tools to keep up that pace.