There is a Missing People of Canada FB page and as of 3 hours ago, it states police are still searching for the trio (scroll down the news feed it's approx. the 3rd story down):
https://www.facebook.com/MissingPeopleCanada
ETA: I think I'll take this info with a grain of salt as not sure where they get their info, and not sure how updated they are, although I would *think* they would be.
Om August 20, police were still looking for the bodies of the murder victims.
August 20, 2014
"Police have been searching for the bodies of Alvin and Kathryn Liknes and Nathan OBrien since they disappeared at the end of June. ... 2014 has been a very challenging year for the homicide unit, says S/Sgt. Mike Cavilla from the Calgary Police Service. Were entering day 52 today, so were almost entering a third month of the investigation. ... The investigators continue to work diligently and long hours, until such time were able to provide answers to the family.
http://globalnews.ca/news/1518228/high-profile-murder-cases-taking-toll-on-calgary-police-officers/