I've noticed that McDonald's has been tailoring itself to early and core millennials ever since we were born. It's as if they ran the numbers in '89 and were like "hook this group. anyone else is a bonus, but this is our market for the next 60 years."
In the early 90s it was toy-ass toys, both in happy meals and at the store (remember those mcdonald's play station things that your rich friends had?). Around the millennium, their whole vibe went late-adolescent/early adult with the whole "I'm lovin' it" nonsense. Over the 2010s, they embraced that godawful industrial minimalist aesthetic everyone liked. Now, they're mashing the nostalgia button & offering up throwbacks to the 90s.
Just you wait, pretty soon they'll offer a retro toy with standard value meals for a $5.99 upcharge.