Recessed power switches on the subs please.
Thinking out of the box... How about a new F1 top with two tens inch drivers with neodymium magnets. The two tens would give the user more punch in full range mode and would give it more height on the sub. The new F1 sub could have double twelves also with neo magnets with fold out legs like the L1 Model II power stands. I think overall the using neo magnets would really help keep the weight down. I think the volume on the new models should be able to achieve a higher SPL measurements than the current F1 series to cover larger events. Just some ideas. 
Would like to be able to power the top from the sub when stacking
A cover the a removable front and back panel to use outdoors in iffy weather
Bluetooth really missing in this great speaker..
F1 812: MSA12X style array control, with optional CSD network connection. No need to include expensive Dante communication, but it would be nice to have software controllable coverage in permanent installations.
F1 sub: wall mount bracket please! Also, more friction on the volume knobs. They tend to shake back to 12 o'clock after a while...