One of the biggest questions to come out of Star Wars: The Rise of Skywalker [1] stems from an aborted discussion between Finn and Rey, two of the sequel trilogy's co-leads. Along with Poe, Chewbacca, C3P0, and BB-8, the duo journey to find a hidden relic that will lead them to a "Wayfinder" that acts as a map to Exogol, where
Star Wars Trio Talks Returning After Rise of Skywalker: "You Ain't Going to Disney Plus Me!"
[2]
That doesn't explain why Finn would be so shy about saying that in front of Poe, but it could be a case of Finn wanting to confirm his news before he tells the other man. Soon after that, Boyega took to his Twitter page to confirm that December 23, 2019 [7]
Boyega's tweet doesn't reveal what Finn was going to say, so we assume he agrees with Abrams's interpretation. Unless he agrees with the popular fan theory that Finn intended to confess his love for Poe because we will also accept that! Secrets notwithstanding, the notion that Finn is force-sensitive has arisen throughout the sequel trilogy and is strongly supported by the events in Rise of Skywalker. Not only is Finn able to sense Rey's imminent danger and (temporary) death but the fact that he sensed the death of a planet in The Force Awakens and managed to adeptly wield a lightsaber against Kylo Ren points to him having some significant connection to the Force.
Links:
[1] https://www.popsugar.co.uk/tag/Star-Wars-The-Rise-of-Skywalker
[2] https://www.popsugar.co.uk/entertainment/star-wars-rise-skywalker-cast-on-staying-in-franchise-46982122
[3] https://twitter.com/ar1aster/status/1208293387310264320?s=20
[4] https://twitter.com/AweMagic/status/1208868284705075200
[5] https://t.co/bc6ONdSB64
[6] https://twitter.com/ar1aster/status/1208870479798231040?ref_src=twsrc%5Etfw
[7] https://twitter.com/JohnBoyega/status/1209077504914444288?ref_src=twsrc%5Etfw
[8] https://www.popsugar.co.uk/entertainment/star-wars-rise-skywalker-cast-on-staying-in-franchise-46982122
[9] https://www.popsugar.co.uk/entertainment/will-there-be-more-star-wars-movies-after-rise-skywalker-47046414