Gilgamesh needs HM/EX versions. Desperately.

[Estellios]

They released an image of Gilgamesh's in-game model ages ago with 6 or 8 arms on him... so yeah there will likely be more.

[Megido]

Yoshi has hinted at it already. He was like 'oh thats perceptive of you random player on twitter, he is indeed using only 2 arms so far!'
It will get harder modes and he'll be walking around with extra arms depending on the difficulty.

[Warlyx]

one of the most funs fights ever! plus the battle on the bridge music <3

[RickmanUK]

If they Do Hard Mode and Extreme Mode... Hard Mode 6 Armed form.. Extreme 6 Arms and Enkidu.

[melflomil]

If they ever do an extreme mode I hope they cut down the time of confused. 9 minutes is ridiculous lol

[Garlyle]

If they ever do an extreme mode I hope they cut down the time of confused. 9 minutes is ridiculous lol

You're supposed to heal confused characters to full to remove it, I think? Either way, my guess about 9m is probably to prevent an awkward case of "oh yeah it was inflicted then the battle ended and your healers took off immediately and now you're standing there like a moron unable to do anything", but still be long enough to ensure that in practice it sticks around for the battle's duration or until they get KO'd.