If you pre-order the game at Gamestop or Amazon you'll receive some DLC's for the game.
Finally, the pre-order bonus for the awaited Dead Space 3 have been unveiled, so if you pre-order and buy the game from Amazon you'll get the Tesla Enervator weapon:
"Sovereign Colonies scientists developed the “Enervator” from an overdriven focus coil to “humanely” eliminate dangerous specimens. The Enervator delivers a precision blast causing instantaneous electrocution and molecular destabilization in the target. In test subjects, death was instantaneous."
And if you pre-order it from GameStop you'll receive the EG-900 SMG:
"EG-900 SMG: This EarthGov-issued sub machinegun is built for urban warfare. It’s compact but deadly, sporting an internal hyper-accelerator for maximum damage."
Dead Space 3 is scheduled to be released on February 5 in the US and February 8 in Europe for Xbox 360, Playstation 3 and PC.