There are now officially four extant manuscripts of Fiore dei Liberi's Flower of Battle. Fabrice Cognot, a doctoral candidate at the Sorbonne, announced this morning that he'd found images from #4 hiding in plain sight on an online database belonging to the Bibliotheque Nationale in Paris. For the medieval martial arts community, this is like finding another Beowulf manuscript.
You can see the new "De Arte Luctandi" by going here and typing 11269 into the search field.
ETA: I should also credit Ken Mondschein, who apparently got the BN to scan the manuscript.