"What's there to be curious about?"
1. Where does Rey and Kylo go from the end of TLJ?
It's pretty obvious all there is going to be is a good vs. bad relation. Rey completely shut our Kylo at the end when she closed the ramp to the Falcon. She gave him a chance, the 2nd chance we've seen in this sequel trilogy, and he's spit in the chances face. He killed Han Solo, he should not be redeemed and it will feel like a cop out if they spent this movie saying that bloodlines do not matter and that anyone can be a hero if they end up keeping Kylo alive for the fact that he's the last Skywalker.
2. How does the Resistance re-build?
It's not the resistance anymore, it's the Rebellion. All Johnson did was revert the political part of the storyline back to what we saw in ANH/ESB, but now the Rebellion is in a worse position then they were in at any point in the Original Trilogy (undeniable since the entire Rebellion now fits in the Falcon).
3. From being nearly decimated, how do/will they "burn the First Order to the ground?"
You got me, it's hard to believe that the Rebellion can come back to all of the losses they experienced in this movie.
4. How will Episode IX deal with Carrie Fisher's untimely passing? (Episode 9 was supposed to be [from what I have heard] all about General Organa finally realizing her Force powers and being the central protagonist.)
Not in the least curious about this because it will be handled in my presumption the most care possible. Which means they will either have a funeral scene at the beginning or it will just simply be mentioned in the opening scroll.
5. Finn finally accepted he was "rebel scum" and Poe emerged as a true leader after learning a hard lesson, what will happen with them and how will their story arc continue/end?
Finn has always been a "good" guy and he has always rebelled against Stormtrooper training. In a lot of the supplemental material he chafes against what he's expected to do as a Stormtrooper and is constantly helping the guy who dies at the beginning of TFA (the guy who wipes the hand print on his face mask) pass his trials along with his own. On top of that he's shown to be in the top 1% of the Stormtrooper trainees. What I'm getting at is he's a competent soldier. His arc in TFA is to stop running from the First Order and instead fight back for what is right. His arc in TLJ is to stop running from the First Order and to fight for the good of the entire galaxy (which at this point is saving the Rebellion). The lesson he learns from DJ is that there are no good sides and that it's better to stay out of the fight, but he's someone who was kidnapped as a child and forced to be a Stormtrooper. It needs to be fought, and Finn should have known that without having to be preached at by Rose or DJ. If JJ continues his characterization from TFA, I'm interested. I'm definitely not as interested if his characterization is continued from TLJ (the butt of the joke). It's tumblr, but here is a link with examples from the supplemental material (like the book released before TFA called Before the Awakens): http://stitchmediamix.tumblr.com/post/171726294234/allaboardtheloonyexpress-yungjedi-like-you
Poe on the other hand has been the right hand of Leia for a long time. Again the supplemental material shows someone completely different than what is shown in TLJ. It's always felt like he was going to take over from Leia and his role in TFA also shows this (he's Leia's most trusted pilot and he also leads the planning and the fight against Starkiller Base). I'm most interested in this, but who know exactly how interested I should be.
6. Is Captain Phasma still alive?
Who cares? Most overrated character since Boba Fett. She has done absolutely nothing and I would say that any conflict with Finn has been resolved (though it was better resolved in one of TLJ's deleted scenes).
7. Will Rey finally meet a foe who pushes her to a breaking point?
Probably not because at this point she does not have anymore internal conflict. TLJ resolved every conflict that she has. She comes to the realization that her parents don't matter, it's the found family that she has gathered that does. The line between her and Kylo has been drawn and for her to make another attempt at redeeming him would be even worse than the attempt in TLJ (which took place at most a week past TFA). I can accept her trying to redeem Kylo because she would not feel like she should be the one to lead the Light Side force users, but I also have a problem with how quickly she went from calling Kylo a monster to pouring her heart out to him and trusting his word over Luke's. Even with Kylo, we're told over and over that they are equal, so unless they want to go major subversion and kill off Rey, she's going to defeat Kylo.
8. How will Kylo act now that he is the First Order's Supreme Leader?
I think it would have been more interesting if Kylo was redeemed (at least partially) or at least separated himself from the First Order so that Episode IX focused more on the fight with the Rebellion and whatever help they get from the New Republic (which is who knows because no one came to help them at their most dire need). This didn't happen, though, so it feels like what we're going to get more of the same with the evil First Order led by a powerful darksider and the good Rebellion led by a powerful lightsider.
9. There are rumors that Episode IX will tie the entire Star Wars franchise together, how will that occur?
TLJ informed us that we should kill the past as it does not matter anymore. Why should we care about the rest of the Saga if TLJ told us not to look back but forward?