Spotted this in a spoiler on the Destiny web site
"You may want to start saving those strange coins guardians, with the new DLC coming out soon there may be a chance that Xur will sell one or more of the DLC exotics on the week that it comes out. Most expensive scenario being him selling 4 exotic items all from the new DLC which would cost 62 coins for all the items."
http://www.bungie.net/en/Forum/Post/70470920/0/0