First two things I noticed:
- Now we know these are both Necrozma forms, not Solgaleo/Lunala forms. I remember the majority of day 1 speculation actually being the latter.
- The names of both forms are specifically being moved forward in time to meet the other (sun/daytime -> twilight, moon/nighttime -> dawn). They could've done backward in time ("dawn" is usually associated with daytime more than nighttime, and vice versa with "twilight"), but they didn't. Wonder if this means anything.