Like everyone else, waiting to separate fact from rumor. The single band 5.8GHz is a departure from Spark's dual band capability, but may not be significant. The Mini operates at a lower voltage, will see how that impacts flight time. Foldability is nice and the unfolded Mini size compares to the Spark as being a little longer, a little wider, a little shorter. Takeoff weight will be a factor, especially if it's less than 250 grams (.55 lbs), therefore not requiring registration. Improved camera will be attractive although 1080p is still the standard for things like YouTube. A 3-axis gimbal would be an upgrade as would more obstacle sensing directions. Expanded capabilities such as waypoints would be most welcome. Of course price and perceived band-for-the-buck rules the day. DJI has been pretty good at targeting price points vs features. The Mavic Air has been a very successful step up from Spark toward the more capable Mavics. It'll be interesting indeed.