These predictions are b.s.: No iPhone SE has ever been a true, standalone model. It's made and sold as a budget option using chassis and many parts from older iPhones, giving budget conscious iPhone users a good option while making Apple a killing on selling many outdated parts a high profit margin.
*Not berating or saying they aren't wildly popular or a great product, they are.
But Apple will never give the SE a new, unique design or new set of features as this would cannibalise sales of the lower-end, non-"Pro" iPhones.
It's always going to be a design that's very obviously "previous generation" in terms of aesthetics, forcing you to get the latest and greatest if you want the most modern iPhone design and best display, cameras, etc.
The next SE will reuse the XR/11 body and display, end of story. Or even another iteration of an iPhone 8, maybe iPhone 8 Plus.
My wildcard prediction would be Apple reviving the 12-13 mini as a new SE. But again, adding a new main chip and other new features, this would render the SE Mini too attractive at $399 and cannibalise too many sales of the newest iPhone of that year.
At best, this would be a mini with an LCD display. No way Apple is giving the next SE an OLED display.
It's going to be a rehash of XR/11 or an iPhone 8 or 8 Plus with the old LCD display. Maybe they'll even cut FaceID to make it feel even less high-end.
It's definitely not going to be a new design