I would like to see a Mavic XL
Same basic design, about 20% larger
Partner with THERMAPP which offers a relatively high resolution thermal sensor (people out to 300m, vehicles out to 500-800) and create an interchangeable gimbal payload for search and rescue, security, house R-Value inspection
Interchangable gimbal package would also allow for upgrading cameras
A 360 degree situational camera (see kogeto Dot) basically downward facing camera that shoots at a mirror shaped like a cone. Software warps the image back into something you can recognize. In automatic mode it will always display whatever direction the velocity vector is in.
It wouldn't work during big maneuvers but in cinematic, tripod or slow speed tracking it will let you simultaneously film the subject with the main camera while a picture-in-picture shows you what you're about to run into if you don't pay attention
360 degree collision avoidance
Anti-wire collision avoidance (forward facing laser "fanned out" perpendicular to the ground) to supplement the normal collision avoidance especially for loss of signal RTH flight. Will also help with trees
Downward facing IR illumination turned on as needed to help VPS at low altitudes /
low light, and for precision landing in low light
Ability to set ATTI mode priority to prevent crazy things from happening while flying indoors
Integrated GPS tracker and sim card
Basic water resistance of the electronics (even if not feasible for the motors), 30m @ 1m
Quick change motors
Dual micro SD card slots for redundant recording should one card go bad on an important shoot, or to allow higher data transmission rates (Think Raid 0 but for SD cards)
GPS grid "estimate" capability of a point of interest. The drone knows it's own location and space (via internal GPS), knows the point of interest's direction from the drone (via internal compass) and knows what angle the camera is at to center it in the display. Using this it calculates and returns an estimated gps location of the subject (estimated because without something like a laser rangefinder it's not going to be precise). Useful for search and rescue, security or LEO work.
Maybe a health monitoring system that tracks temp, stability etc of each motor to predict failure, recommending replacement.
Also experiment with software solutions to see if there is a way to compensate for loss of a motor in flight (not allow you to control it, but just keep it upright and emergency land at a safer downward velocity. This isn't to save the drone, but reduce risk of injuring anyone around)
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Maybe a companion tethered drone. Like the MAVIC XL but tethered. Power is fed via wire from ground with large battery, inverter, generator or wall socket. Battery not needed, except maybe just enough for emergency descent should power be interrupted. Weight saved can go towards payload (HAM radio repeater or similar to get a signal higher, thermal camera for security work, high res camera for news, etc).
8 motors (same location, but one facing down and one facing up, to allow for redundancy and reduced load on each individual motor), won't fold up the same but maybe quick disconnect arms. Drone keeps constant tension on cable and attempts to counter wind to stay as vertical as possible. Max alt: 400 feet, max duration: potentially until a component fails so long as power is available