The demo coming on the 14th will not include any of the co-op campaign that will be new to the series unless you have activated your Battlefield 3 online pass or though other opportunities that will be announced in the near future www.masseffect.com. The demo for co-op will become available for everyone on February 17th.
Are you excited to be able to jump into Mass Effect 3 in less than a month? Are the days leading up to March 6th crawling by? Let us know in the comments!