My guesses:

• Same pill size
• Better cameras (just say this every time and people will believe you no matter what)
• Maybe a bigger camera bump
• Better satellite connectivity
• Better 5G modem
• New emojis (wow!)
• Better photo processing (another safe guess)
• Slightly more widget support, for home and lock screens
• Tweaked crash detection (for rollercoasters and such)

Overall, I don't see any other major features from other manufacturers for some time. Stuff like folding screens, cameras under the display, and ridiculous fast charging don't seem refined enough yet for Apple to implement "in their own way" yet. I'm safely betting on next year's lineup being more like the 14 than not.