http://lmgtfy.com/?q=what+does+bmw+lci+stand+for
People have converted a pre-LCI car to a LCI car. The majority of the differences is the body panels. I think the list is for a e90: new hood, front bumper, trunk and head/taillights. There might be a few other body differences but I never fully looked into it. E92's have new taillights and not sure from that point on.
on here for the conversion.