Frank The Movie (2014) Michael Fassbender, 

This movie has been inspired by the Frank Sidebottom characture, the moview is NOT about Frank Sidebottom.
May Frank Sidebottom fans are going to get confused abut the ethos of the movie, but when Chris (the man behind the mask) was alive he approved and new it was going to happen. The family are also supportive and have no issues.
Its a dark movie, dry in places, with a number of quirks, and as the moview concludes, there is an underlining message that some will "get" and understand.
One of those films that will be ver marmite (a bit like Frank Sidebottom) you will either love it, or you will not, with very little middle ground.

The movie is sceduled for a May 2014 (UK) release 

Director Lenny Abrahamson talks to The Playlist about his movie "Frank" on March 11, 2014 at the South By Southwest Film Conference. "Frank," which will be released by Magnolia, stars Michael Fassbender, Maggie Gyllenhaal and Domhnall Gleeson in an unlikely band on the fringes of the music world.

Here is what Jon Ronson has to say about the movie. 

 Hello. I’m Jon Ronson. For three years in the late 1980s I was Frank’s keyboard player. I lost touch with Chris for a long time but around 2006 he contacted me out of the blue to ask if I’d write something in The Guardian about my time in the band. Chris liked the story I wrote and so did my friend, the screenwriter Peter Straughan. Together, with Chris’s approval, we started writing a screenplay about an outsider artist/musician inspired by Frank. The story - we all decided from the beginning - would be totally fictional but have elements of the themes from that Guardian article. The film is made now - Frank. It’s about a man who wears a head similar to Frank Sidebottom’s head. But unlike Chris, he never takes it off. I think it’s wonderful that Chris’s extraordinary creation continues to inspire British culture - there’s our fictional film, Steve’s Being Frank documentary, Neil’s statue, my short eBook, and so on. Frank lives in many ways. 

Here are what the 'The Sievey family' say about the film "FRANK"

Harry
"When I think about Frank Sidebottom, I think about how he wasn't afraid to do things differently, even if he was the only one who understood it. He was also very often unpredictable, and its these ethics that inspired the "Frank" film. The beautiful shot film captures the excitement and emotion of what it would be like to be involved in the band of such a character. From its happy to its more melancholic moments, Michael Fassbender and crew really deliver the story of this emotional roller coaster."

Asher:
"I didn't really know what to expect when i watched the film FRANK. To be honest there were parts where I laughed, parts where i cringed.... but I think Jon Ronson has done a great job with the film and the film makers worked with us 'The Sievey family' keeping us informed of the films progress. Before my dad passed he had already consented to the film FRANK being made.
No doubt that it will confuse and cause conflict amongst Frank Sidebottom fans as people ask, why have they changed the head, why have they changed the voice, Frank is from Timperley not America! The film is just inspired by Frank, not actually about Frank Sidebottom. It's more the idea of a man behind a mask, as he struggles to face the world, as unlike Frank Sidebottom, he doesn't take his head off!
The film is understandably not everyone's cup of tea, but neither was Frank Sidebottom! "

Stirling:
"Having watched the film Frank, i found it entertaining and enjoyable, and I know that my Dad would have loved the series of crazy coatic events, that are loosely based on his own character invention. My dad loved things that were far fetched and out there, and I think he would be truely happy with the finished film, and it is a shame he never got to see what he helped to create."