Do you really think they're only going to show gameplay and nothing else? They are obviously going to go over at least a few other points but you can't be asking for the world dude. This is the first reveal do you expect them to go into immense detail? No they're going to give us a taste for what's to come.
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I think they will show a lot off, it's coming out pretty soon so I imagine it's basically done now it's just polishing