The opening movie for Heavensward (the one that plays if you afk at the title screen long enough) contains major spoilers for those who haven't finished ARR story yet. That's a major oversight from SE IMO, since you HAVE TO finish ARR story before starting HW.
I'm sure it's because you can't even do anything Heavensward until you complete the storyline. For new players they won't really know what is what until they reach that part, and they'll probably stop watching the intro well before then.
Maybe, I still watch it for the singing part.
Kali, the biggest spoiler happens right off the bat, it's easily comprehensible by new players. It doesn't only concern new players anyways, it concerns returning players who have yet to finish the story as well.
But anyways, my friend just told me that Yoshi-P addressed this point by asking players to finish ARR before buying HW. To me, that doesn't sound practical, considering that bundles are being sold. Plus, I bought HW as a digital copy, didn't see any spoiler warnings.
P.S. I'm a returning player who bought HW with some ARR main scenario quests left to do, but I already know about the conclusion of ARR's story.