Being a weapon collector, Gilgamesh brings a number of arms into a fight. Each time he attacks he changes weapons. It sounds like you won’t know which sword Gilgamesh uses for each strike because he doesn’t even know himself. During what appears to be Gilgamesh’s EX-Burst, he drew the powerful Excalibur sword.
V-Jump also mentions the magazine will give readers a code to download a Leon costume for Squall. The Dissidia 012[duodecim]: Final Fantasy legacy edition found in Europe includes a code for this extra outfit. Square Enix has not mentioned the Leon costume or how to acquire it in North America at this tiime.