It’s important to remember that the early stage of the film’s production means that any rumors about it should be taken with a large grain of salt. Fans love to speculate and right now they have a lot of opportunity to spread misinformation about the new film, so those looking out for rumors should always approach everything they read with a skeptical mindset.
Otherwise, it’s easy to get sucked into a whirlwind of rumors that are difficult to confirm and may turn out to be false in the end, which can certainly add to a person’s disappointment with the actual film, even if it turns out to be pretty good in general.
Fans should mostly watch for official messages from the film’s producers and other people attached to the project, and thankfully we’ve been getting those here and there, although the communication has definitely been rather vague.
That’s probably understandable, considering that there is most likely still a lot of work left to be done on “Frozen 2”, and the producers don’t want to spoil any of their ideas for the film until they are certain that they want to do them. Plus, Disney tend to be relatively quiet about their upcoming projects in general until they have enough information to show the world, which is usually a bit later into the production process.