I think Finn is Force Sensitive. I think Rey is Force Sensitive. I actually think Poe is Force Sensitive as well. I don't think The Force Awakens is a title that refers to only one or two characters. I think the Force itself will be an active character in this trilogy. What is it? What is its nature, and how does it truly affect the universe in a real way?
Having multiple force users doesn't mean each of their character arcs are going to play out the same way. It doesn't mean that the Jedi specifically are coming back. Luke apparently tried that and it was taken way from him. At great cost.
If I were designing this trilogy, I'd be very interested in exploring how the Force becomes a relevant part of the universe again. The PT showed us the Force being used in a very dogmatic, rigid way with the Jedi Order, and the Sith using the Force for subterfuge and deceit, in an attempt by Palpatine to sieze control.
In the OT, the Force was dormant, an "ancient" religion that very few individuals outside of Darth Vader (I don't even think the Empire knew Palpatine had force powers), and it wasn't until Luke Skywalker used the Force and his damned annoying earnestness to redeem/save his father, and overthrow the corrupt Empire that the Force became active again.
For this Sequel Trilogy, I imagine we are going to see a universe being brought into the realization that the Force is a real, active part of the very fabric of creation. We'll see this played out through multiple perspectives, specifically:
An orphan left alone on an outer rim desert planet, who feels lost, but with a calling she can't explain to belong somewhere. Through a trial by fire, she learns more about herself than she ever dreamed. Will that path lead her to light or dark? Will she find a willing teacher in Luke Skywalker? That's her arc for the trilogy.
An orphan raised to do one thing: fight, and kill. He was brought up viewing the Force and the Jedi as something to be feared, hated, the enemy. He then learns that the very ideology he was born into was flawed, a lie, and it pulls the rug out from underneath him. He now feels he has nothing to fight for, then he meets Rey, and together, they go on a parallel journey that awakens Finn's inner hero. How crazy and emotional would it be for someone who was indoctrinated by the Empire, or First Order to loathe Luke Skywalker and the Jedi, and therefore, the Force, to learn that he, himself, has the very potential to harness that power? How will that change him? How will he respond? That is his arc.
Poe is a question mark, but if also Force sensitive, I can see how his arc would revolve around him being a hot shot, brash, impulsive ace pilot for the Resistance, who awakens to his potential to the Force. How will this change the way he perceives the world? How will it change how his peers perceive him? What is his new place in this world where the Force is no longer in the shadows? That could potentially be his arc if he is also Force Sensitive.
Kylo Ren's arc could be the most powerful, in that he starts off already on a dark path. Not Sith, but seemingly abandoned by his family, corrupted by a "father" figure who is likely grooming him for his own means, driving him to kill his biological father, which will no doubt scar him if his path is also similar to his grandfathers, which is one of redemption (I really think that by the end of this trilogy, Kylo will be fighting alongside the heroes to stop Snoke, after having awoken to the errors of his thinking, either by Rey, Luke, Finn, or Poe). That could be compelling.
Star Wars, at its core, is really simple storytelling. It's archetypes are mythical, it's story points broad, but the characterization is where we get all the depth from. It doesn't matter how many super weapons the villains create, and the heroes destroy. What matters is the character drama and arcs that drive those events forward. The new trilogy is set up to deliver a lot of material to work with over the course of those three movies, and it can go in any direction.
There's no guarantee that any of the Force sensitive characters will become Jedi, or even WANT to be Jedi by the end of this series. They want to find Luke to answer questions, yes, but it's very possible that their desire to become Jedi or even heroes/villains, isn't part of their ambition.
At the end of the day, for me, it doesn't matter how many series callbacks or nostalgia the film has, because I find the new cast incredibly compelling because their potential for great drama/storytelling is so great, based off of just the core setups for each character that we've been given so far.
Also, Snoke looks awesome. I hope the final design is a mix of both the left and the right. Serkis is fantastic in everything I've seen him in, so I'm very excited for his performance.
Han, Luke, and Leia are just icing on the cake, but I was on board when I learned who the new cast was going to be. I think Episode VIII is going to be really, really good based off of the framework set up with TFA.