New firmware has been released for the Mavic Mini. Here are the notable changes:
Added manual exposure for videos (requires DJI Fly v1.0.8 or later)
Added 2.7K 24fps and 1080P 24/48fps resolution (requires DJI Fly v1.0.8 or later)
Improved flight stability in some scenarios
Optimized remote controller performance
The full list of changes are available in the Mavic Mini release notes on the Mavic Mini downloads page.