According to the Mavic Mini listing, the drone weighs in at just 249 grams. Drones 250 grams or heavier require FAA registration, so Mavic Mini owners can get started without any bureaucratic delays. The Mavic Mini has a max flight time of 30 minutes, and on Newegg, it's listed for $645.20 Canadian dollars, about $495.
The Mavic Mini only has a 2.7K camera. That's a drop compared to the 4K resolution on the Mavic Air and Mavic Pro models. But as DroneDJ points out, that could be an attempt to stop the Mavic Mini from cutting into the sales of its existing drones too much.
We still don't know when DJI might release the drone, though rumors speculate it could be as soon as October 30th. The company is set to make an announcement Wednesday, so at the very least, we may get more details then.