One of the developers of Dead Space 3, Executive Producer Steve Papoutsis, has a put up a blog entry in the Dead Space 3 site detailing what sort of new features fans can expect in this instalment of the series. Most of it is what a lot of people have probably heard or know about already (the Mass Effect 3 N7 Armour, scavenger bots and resources for weapons crafting), but a few new things include the four extra game modes that you can unlock after you beat the game, and the fact that their development team is "hard at work on a top secret additional story that will be coming in a few weeks. We're not saying much, yet - but think "disturbing" to get your imaginations going" - so probably a story DLC for later on.
Here's an excerpt from the blog about the extra game modes, but check out the Dead Space 3 Dev Blog to read all the details:
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What else can you choose to do? How about play DS3 in 4 unlockable game modes! Each mode is on-disc, and becomes available when you beat the game once. There’s New Game+, which lets you start a new game with all your upgrades and arsenal intact. There’s Classic Mode, which is for the DS1 veterans out there. It’s single-player only, uses “classic” aiming, and there’s no crafting – all weapons have to be built from blueprints, a la the original game.
Another mode is Pure Survival Mode. If you like survival horror and resource management, this is the mode for you. Enemies ONLY drop resources, and there’s no ammo, health, or weapon parts to be found. You’ll have to choose what to craft every time you see a bench. Upgrade? Med Pack? Plasma Core? Think fast – there’s a Waster right around the corner! Finally, we have the aptly-named Hardcore Mode. Choose this mode, and you only get one life to live for the entire campaign. Make sure to wear a clean pair of boxers when you play…