the catastrophe in the 7th Umbral Era will likely involve the moon Dalamud. I mean they've put a lot of lore into the moon coming down and killing us all, even going so far as to implicate the Garleans.

-When side-quests were first introduced there was an NPC that commented on the fact that Dalamud seemed to be growing larger and of course turning red.

-In the early GC cutscenes Cid is seen muttering about Meteor.

-The bombard event featured large bombs which descended from the heavens upon small meteors. Pieces of these bombards were made into earrings in the shape of the twin moons in the following event which were stolen by Moon Mice.
-I can't remember the specific quote but after completing the low rank Ifrit quest the elezen in the robe suggests that the Garleans may be behind Dalamuds impending descent to Eorzea.

-The 7th Umbral Era storyline will likely become unavailable post 2.0 release. Which means the catastrophe involved in this era will come to a head and likely alter the entire world as we know it.

This last sentence in bold, pretty much makes me want to pay and see the whole event unfold. I can only imagine what a spectacular ride its going to be
So those who says game is beta and dont wanna pay the low cost of 13$ a month will probably miss out on a great time and will never be able to see it for themselves.