Some preliminary spoilers that build on what Geekdom has already said...
Spoiler:
-Freeza serves as a punching bag while Vegeta learns fusion and Gogeta is formed.
-Evidently the fusion does indeed last 30 minutes here.
-Goku says that Broly is the strongest opponent he has EVER fought.
-SSB Gogeta victimizes FPSSJ Broly.
-Broly is saved by the wish from Chelye. We have NOT seen the last of him.
-Broly's power is compared to that of Beerus.
There will be more spoilers to come... But as expected, it's sounding like everything Geekdom said was 100% accurate.
More...
Spoiler:
-Freeza kills Paragus, which is what forces Broly to become SSJ.
-Goku and Vegeta fail the fusion a few times -- the fat and slim versions of Gogeta are both in the movie.
-Bardock DOES rebel against Freeza in the flashback.
-The wish of Freeza is to grow 5cm and Bulma's is to become 5 years younger.
-Gogeta stops Broly from killing Freeza.
-In the midst of this, Broly attacks Whis who has fun with him, and casually dodges everything Broly throws his way with a smile on his face.
-SSB Gogeta shitstomps FPSSJ Broly.
-Broly is teleported back to the planet he grew up on thanks to Chelye's wish.
-After Chelye and Lemo find Broly, Goku ITs there with food from Bulma. Goku says that he wants to see them from time to time to fight with Broly.
-Goku says that Broly might be stronger than Beerus.
-There is no ultra instinct...or Kaioken...or Vegeta Blue Evolution...or Gohan in the movie.**And apparently the "Goku finally...!" thing is that Goku finally calls himself "Kakarot" at the end of the film.
So if indeed
Spoiler:then the scaling after this film would look something like this:
FPSSJ Broly ~/> Beerus
Spoiler:
SSB Gogeta >>> FPSSJ Broly ~/> Beerus > MUI Goku > FP Jiren > everyone else.
However, the Beerus scaling might be subject to scrutiny given that
Spoiler:
Goku has technically never seen a full power Beerus in anime canon -- he's only seen Beerus fully cut loose in the manga... Though I think the authorial intent here is clear. /shrug
As for Broly's power...
Spoiler:
-In his 'normal' form he is capable of stomping SSG Goku and SSG Vegeta individually.
-In his 'anger' form he is capable of stomping SSB Goku and SSB Vegeta individually.
-In his 'SSJ' form he is capable of stomping the absolute shit out of SSB Goku + SSB Vegeta... And Golden Freeza as well. This is when he starts becoming berserker and attacking everything in sight.
-Broly was so far beyond Goku and Vegeta at this point that all Goku could think to do was use IT to flee the battlefield with Vegeta before they both were killed.
-After running away to Piccolo's location, the idea of fusion comes up. This is when Piccolo helps teach Vegeta the dance.
-As mentioned, it takes a few tries for them to get the dance right. During this time, Broly is pummeling the shit out of Freeza.
-Apparently base Gogeta arrives back to the field, and is capable of easily contending with SSJ Broly initially.
-Broly continues to evolve and eventually reaches his 'FPSSJ' state. Gogeta then activates SSB, and proceeds to completely ragdoll him. Broly is saved just before Gogeta delivers the final blast.
-When Goku ITs to Broly's planet a few days later, it sounds like they've become friends of sorts. Again, Broly is NOT evil in this.
Geekdom has confirmed all of the above info, btw. So all the spoilers mentioned thus far are legit.
The only "?s" right now are:
Spoiler:
a.) Which forms Gogeta uses. SSB for sure, but there are conflicting reports as to the forms he uses beforehand(some have said base, some have said SSJ, some have said SSG.)b.) If Cooler(ie. the brother of Freeza) was actually referenced.
Those questions should be answered in the days to come.