I found a neat little explanation for future progressive, when there isn't a future simple time to relate it to. "Something will happen in the natural course of events." This is upper-level English. The sentences "The gate will open soon", "The gate opens soon", "The gate is opening soon", "The gate is going to open soon" and so on are all correct, but suggest different situations for the future event.

in my opinion, both are correct. It is present progressive because The use "ing" . However, because both sentences have not happened yet, WILL indicates that both are 'future progressive tenses'. E.g present: "I'm eating right now" "i'm walking home" Future: "i will go home soon" - has happened yet. "I will eat later" your sentence is correct. Both are just variations of each other. Hope this helps. Your english is great!

Matty is right. Both variations are correct, one just happens to have the -ing at the end instead of the other. Neither are wrong. Your English is very well done :)

I agree with the answer below, Frozen is a childs movie so the scentenced is structerd so its fluency and progression are smooth so it impresses the audience.