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The director already stated, which I posted a while back, that Luca and Alberto are not in any romantic relationship. He said this after many people online made the correlation to Call Me By Your Name.
It's in the first two paragraphs for anyone who wants to read it
Cast features Jacob Tremblay, Jack Dylan Grazer, Maya Rudolph, and Jim Gaffigan
https://ew.com/movies/pixar-luca-trailer-jacob-tremblay/?utm_campaign=entertainmentweekly_entertainmentweekly&utm_content=new&utm_medium=social&utm_source=twitter.com&utm_term=6037ae9dc430550001379529
Sadly, it didn't come last night. However, it's definitely coming today. Tom is teasing it and a scooper (with a good track record when it comes to trailers) said something too.