Kind of random, but there isn't much to talk about (aside from the rad new episode titles, but I can't say anything that hasn't already been said)…
I'm really curious to see more of how the world was affected by the presence of Gems. We already know there are two states named Delmarva and Keystone, but what really gets me going is one of Steven's lines in So Many Birthdays: "The piñata is an artifact from ancient Aquamexico."
We know that Aqua-Mexican is a restaurant, since that's where Amethyst got the tuna burrito. ("That place closed down, like, five years ago" etc.) but when describing the piñata, Steven clearly says "Aquamexico." We've seen in screenshots that Florida, well, isn't there. Could it have sunken into the water as a result of the Gem Wars? Is our "Florida" SU's "Aqua-Mexico/Aquamexico/Aguamexico"?
On a slightly related note, the word "Mexico" is theorized to be a portmanteau of the Nahuatl words mētztli (moon) and xīctli (navel). Navel? Navel. (See where I'm going with this?)
The navel thing is definitely reading too deeply into things, but it's a cool little factoid that supports my headcanon that Gems and fusion influenced early world religion (Hinduism, Mayan/Olmec/Aztec mythology, etc.)
Anyway, there's my first-ever Steven Universe theory. :P