Wi-Fli technology moves to the top end Red and Force groups. They have a longer parallelogram link, B knuckle and an 80mm cage.
This lets you run a much larger, wider range cassette on the high end groups, and new cassettes are coming to go with them. The new Red cassette will soon be offered in as large as a 11-32 with at least one more option between it and the current Red cassettes. Likely you’ll see a similar range for Force-level cassettes.
These Wi-Fli rear derailleurs will weigh in at 164g (Red) and 190g (Force). They should be out in June.
