Well, we could use this thread to discuss Omega Weapon at least.

Honestly it feels a bit early to introduce it I think. Also, from past FF games Omega Weapon was usually designed to destroy Shinryu, so they apparently took some creative liberties with this.

I think it's a pretty safe bet to wager that an Ascian is controlling Teledji Alaledji, just as it's shown at the end of the main storyline that the Ascians (and not Shiva, probably to some people's disappointment) are controlling the Archbishop of Ishgard. The Ascians are an ancient race, but do they contain the level of knowledge that the Allagans had to be able to reawaken the Omega Weapon? Time will tell.