They also put a very short trailer on Deus Ex official youtube channel to tease even more. Additional fuel to the fire was added just a couple of hours after the first tweet and it said "Who is Ben Saxon? #DeusEx." And if you check this name on Deus Ex Wiki, you will easily find the answer.
Ben Saxon is one of the two main characters in the book Deus Ex: Icarus Effect, therefore we can rightly expect an announcement about a new chapter of Deus Ex that will very likely occur during the upcoming E3 next week.
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