Not much there yet. In active development.
W,A,S,D - Move.
Q,E - Fly Down/Up.
Ctrl - Lock Z direction.
Shift - Fly faster.
T - Fly very fast.
F3 - Switch capturing mouse.
F5 - Console. Tab to switch through commands. (Doesn't do anything usefull right now.)
F6 - Gui panel.
F7 - App statistics.
F8 - Debug info text.
F11 - Switch fullscreen/windowed.