All in the manual. But it's been a while since I revisited the manual.
And they mean literally what they say:
Times Charged (under aircraft battery screen).
means number of times you charged the flight battery.
Enable Hardware Coding (under General Settings Screen).
means enable tablet hardware coding (to make the app's videoscreen run smoother)
Cache Video During Video Shooting (under General Settings Screen).
means cache video to tablet memory/disk so you can see a preview (or make a preview clip in Director) right after shooting. If you don't use it you can turn that off. Some tablets or phones are slow in writing to cache and you could experience performance problems.
Coach mode is new, enables you to use an extra slave controller for an instructor/student setup.
