From a media release:
Corner Gas: The Movie will roll out as a multi-platform event beginning with an exclusive Cineplex Front Row Centre Events theatrical debut across Canada, December 3 to 7, 2014, it was announced today.
The theatrical premiere will feature in-theatre cast appearances across the country, a CORNER GAS Tweet Up, giveaways and a special pre-event show including a special message from Brent Butt, CORNER GAS trivia, and excerpts from the Canada-wide CORNER GAS Sing-a-long. Fans are encouraged to show off their hometown’s CORNER GAS pride. Beginning today fans can visit cornergasthemovie.com and Light Up the Map of Canada. By casting their vote online, fans have the opportunity to bring Corner Gas: The Movie to their hometown theatre.
Immediately following its theatrical release, the 90-minute feature will make its network broadcast debut in December on CTV and CTV GO, following a special preview for The Movie Network and TMN GO subscribers. The movie will also air on The Comedy Network in December (all broadcast dates to be announced), complemented by a special collector’s edition DVD available for purchase before the holidays. 
Headlined by creator and comedian Brent Butt, Corner Gas: The Movie stars the original award-winning ensemble cast including Gabrielle Miller, Eric Peterson, Fred Ewanuick, Janet Wright, Lorne Cardinal, Tara Spencer-Nairn, and Nancy Robertson. Written by Brent Butt, Andrew Carr, and Andrew Wreggitt, and directed by David Storey, who served as key director on the series, the movie was shot in Saskatchewan from June 22 to July 22, 2014.
It’s been five years, and there’s still not a lot going on 40 kilometers from nowhere. But that’s all about to change as the fine folks of Dog River, Saskatchewan, face their biggest crisis ever. Brent and the gang discover that the town’s been badly mismanaged, leaving residents with little choice but to pack up and leave. As residents make one last rally to save Dog River as they know it, they discover a devious plan by a corporate giant that would change life for Dog Riverites forever.
