The Bears open training camp in Bourbonnais today.  One of the faces missing from the practice field this afternoon will be first-round draft pick Chris Williams.  The rookie left tackle is one of seven first-round selections yet to sign a contract.  Brian Urlacher arrived at Olivet Nazarene University late last night on the heels of agreeing to a new contract, which will keep the linebacker in blue and orange through the 2012 season.  The Bears open their preseason schedule on August 7th when they host the Chiefs.  The regular regular season opens on September 7th in Indianapolis.