They're calling it a "secondary" logo. Is this an attempt to make is slightly more politically correct/less ethnic-y?
http://www.underconsideration.com/brandnew/archives/celtics_secondary_logo.php#.U7GF_fldVyw
http://www.underconsideration.com/brandnew/archives/celtics_secondary_logo.php#.U7GF_fldVyw