Nope. Halo CE Anniversary and Halo 2 Anniversary are the only remasters. The only improvements the others are getting are support for up to 4K resolution, uncapped frame-rates (which was a major complaint with Halo 5 Forge on PC), and supposedly significantly smoother gameplay on keyboard plus mouse.
Hiddenxperia was part of the community team that helped work on this. That is why he knew about this for over six months. He just had to keep it a secret.
Letting members of a fandom participate in development processes means that the game devs/publishers are taking the project seriously and are genuinely listening to the fans' complaints.
However, I must disagree with community participation in movie-making. The story-tellers must tell the stories they want to tell, and not give in to fanservice. Can you imagine a Star Wars movie made with community help? It'd essentially be a terrible and soulless fanfiction.
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