Twin Mill was shown at Toy Fair 2025, however this is first official photography that has been shown, including an in package shot, which makes this figure look to be the size of a standard Hot-Wheel based on the peg and packaging layout.
Also rather than carrying a big stick, these photos seem to confirm that Twin Mill will include blast effects (your mileage may vary).
Twin Mill looks to be a crazy Hot Wheels concept car with dual engine intakes that double as wrist cannons.