This is a really really exciting trailer and it seems everyone has their interpretation of what everything means/symbolises.

Figured I could use some of my Classics degree for once, combine it with my many replays of the original game and have a damn fun conjecture. Plus picking apart cryptic trailers like this will give us Deus Ex fans something cathartic to occupy our time with :)

Those who have played the original will be familiar with the 3 AIs; Daedalus, Icarus and Helios.

Both Icarus and Helios appear to represented in this trailer, albeit in their classical context. For those who don't know their myths, Icarus was the son of Daedalus. Both attempted to flee from the island of Crete using wings held together with wax. Daedalus warned his son Icarus not to fly too close to the sun (Helios). However during their flight, Icarus; so overcome with the act of soaring through the clouds mistakenly flies too close to the sun and the wax holding his wings together melts, causing him to plummet into the sea and drown.

The symbolism of these three names will be immediately obvious to those who have played the original game. However for those in the dark, Daedalus and Icarus merge to become the Helios AI. Though not literally the same as the myth, the symbolic absorption of Icarus and Daedalus is apparent.

With the above in mind, the dream sequence of the trailer is more clear. This appears to be a reference to the end of the Icarus AI and the creation of Helios. Whether this is a premonition or some kind of encoded vision in the protagonist's mind is too early to say. Regardless he clearly has some relationship with the Icarus AI. Perhaps he is in some way associated with the original Majestic 12.

Majestic 12 in mind, leads us to the men surrounding the dream Icarus. Yeah, they're them.

...

Any more conjecture would be as watertight as a sieve, though it is clear these men are symbolically working on the Icarus AI, we're not given any kind of context. Or are we? GET GUESSING!

Post dream sequence, the similarities to the Dentons in the main protagonist are immediately apparent. Now again this is where we're meant to guess at who he is and what his obvious relationship to the Dentons actually is, and I've got a few ideas.

He mentions that he "never wanted this", which combined with the armed men entering his apartment, leads me to believe that he is an escaped patient from some advanced facility. Combine this with his previous dream, I can guess that this facility belongs to Majestic 12. Now considering MJ12 created the Dentons and that this guys looks suspiciously like them, it would seem likely that he is in some way a prototype for the Denton brothers.

That's all I can think of for now. Thoughts?