So a tech demo happened today:
If you look from the demo you can see 2 interesting things. At 2:50, you can see that when he summons Titan, it says Summon ID: 3, Have: 7 in the bottom right corner. Either meaning there are 7 summons in the game, and we may or may not get more, who knows.
Next, at 2:02, this happened
http://imgur.com/a/FAETj
Look in the middle/bottom right corner. Those are coordinates. Did we just get an actual map size? There are area coordinate vs world coordinates. Does anybody know how to get a sense of scale with that?