Apparently the working title is A Haunted House 2 -- just keep it.
Open Road Films has acquired U.S. distribution rights to IM Global's sequel to the 2013 box office hit A Haunted House. The film has been fast-tracked to hit theaters in the winter.Source: The Hollywood Reporter
The sequel – with a working title of A Haunted House 2 – will be co-written by and star Marlon Wayans.