Some Dead Space fans have been a little wary over the third game in the series since it was announced to have co-op play. If you're curious to see how the game will stack up with the new element, then perhaps it will be worth checking out the demo. Thankfully, it will be out a few weeks before the game arrives on shelves.
Both 360 and PS3 owners will be able to gain access to the demo on January 22nd. This is two weeks before the February 5th release on PS3, 360, and PC. The demo will feature a bit of campaign with both Isaac Clarke and his new companion John Carver. That way, both fans old and new should be able to test out the co-op mechanics to see if they enjoy them at all.
It is possible to gain access to the demo a little earlier as well. 360 owners who would like to start playing on January 15th must sign up on this site. It is not mentioned if you must have a Gold account or not for this, so Silver members are probably allowed in early as well. As for PSN, there is currently no mention of PS Plus members gaining early access.