Lyle and Marie McCann of St. Albert disappeared in July 2010 while on their way to a family gathering in British Columbia.
Travis Vader's preliminary is to be held in provincial court in Stony Plain, Alta., between Sept. 9 and Oct. 25 of next year.
Neither Vader nor his lawyer appeared in court in Edson when the dates were set.
A pre-trial conference involving the defence, the Crown prosecutor and a judge is set to resume on Dec. 14.
A burnt-out motorhome belonging to the McCanns was found west of Edmonton two days after they were last seen, but their bodies have never been found.