This thread should be read.
The thing is, they know how great the first game was:
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The first game in the series received almost universal critical and industry acclaim, including being named "Best PC Game of All Time" in a 2007 poll carried out by UK gaming magazine PC Zone, and after its release was a frequent candidate for and winner of numerous 'Game of the Year' awards.
They also understand how important the story and writing is behind such a project.
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Deus Ex 1 & 2 writer Sheldon Pacotti has been enlisted as story consultant and has been working with the EM team and original creators Warren Spector & Harvey Smith have been spoken to.
This thread is a FAQ, so there's a lot of neat information about the game there (here are some things that interested me):
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You start pure, but as the story unfolds you are forced to augment yourself in order to survive and achieve objectives. Adam has a history leading up to the events that start the game, so his background is well fleshed out and we will learn more about him and his past, and his future, as the game progresses.
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Deus Ex: HR is FIRST person, but switches to third person for some contextual elements, after which it quickly returns to first person. DX:HR still has a component of action, a component of RPG, and a component of open-ended gameplay. You can play it the way you want - just as in the original game. If you want to be a stealth agent, or if you prefer to be a John Rambo, the choice is yours. You can play the entire game using combat... or you can play using stealth. Or, you can play the entire game going back and forth between both. The key is CHOICE. As the player, you are able to play the game the way you want to play it.
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JC Denton won't be born for two years and there are no known cases of human nano-augmentation, only mechs like Gunther Hermann and Anna Navarre. In Deus Ex: HR, you'll get full-blown, heavy-duty body part replacements, rather than clean and invisible sub-dermal nano-tech. These upgradeable implants don't look quite like the clunky 'Roboscopian' attachments that we saw on Gunther and Anna, they've been visually redesigned to be closer to modern-day prosthetics: smooth skintone plastic plates cladding a steel endoskeleton. Since each aug you install can visibly alter your character (but not all of them do), your choices customise your appearance at the same time as your abilities. Some of the mechanical augmentations passively improve your abilities, and can also take the form of special combat moves. As you use some of these special moves, the camera pulls back to show you doing it. It will also switch to third person when you make use of the game's new cover system. This should allow for more tactical combat as you will be using it in combat for the tactical aspect, but also when you're stealthy, because the camera allows you to see more what the enemies are doing.
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DX:HR will use experience gained through completing objectives, exploration, or other means to "upgrade" or "learn better use of" purchased augmentations. There is some versatility in character build; you aren't forced to use your skill points in the same manner at the beginning of the game, you can use other configurations and clear the levels of the game. You can modify yourself and your weapons to be able to do different things and also in the physical world there are different ways to complete an objective. It's about multi-path and multi-solution - it depends on your own personal style of play. But you won't be able to get every augmentation or weapon in one playthrough - as mentioned already, Deus Ex: Human Revolution is about choice and consequences, so multiple playthroughs will be required to find and use everything.
Experience Points accumulated during the game experience are spent to gain new, or improve upon, already possessed talents conferred by augmentation. As an example: everyone can shoot a gun, simple point and shoot. Only practice and experience will make you a better shot. Same applies to hacking: everyone can use a low level hacking software to help out, but skilled and experienced hackers will be faster, better, and have less risk of getting noticed while on their endeavor. You can spend skill points on augs. Weapons are upgraded by other means, such as with money or if you find an upgrade in the environment (i.e. searching off the beaten path). But your handling of the weapons are "upgraded" via augmentation (recoil and accuracy) which are basically "arm augment" related.
Er, I'll let you read the rest on your own.