(After noticing this change, we went back and compared the “rev3” Uno schematics PDF on arduino.cc to the “rev3E” schematics on arduino.org. Yup, same change in the legal notice.) ...

The WiFi version comes with an Espressif S3 WiFi module, that will help to expand creative opportunities for makers, educators, and hobbyists according to Arduino. The UNO R4 maintains the same form ...

“Uno R4 WiFi includes an error-catching mechanism that detects run-time crashes and provides detailed explanations and hints about the code line causing the crash,” according to Arduino – Electronics ...