Who is the so called "Fifth Beatle"?  The honor of that informal title has been associated with several individuals throughout the years, including famed New York disc jockey Murray the K, musician Billy Preston who performed on later Beatles albums, Australian disc jockey Bob Rogers.  Some fans might say the fifth Beatle is former drummer Pete Best. At the Beatles' 1988 induction into the Rock and Roll Hall of Fame, George Harrison stated that there were two "fifth Beatles": Derek Taylor and Neil Aspinall.. And Paul McCartney is quoted as having said
"If anyone was the fifth Beatle it was Brian" (Epstein).
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(Eppylover Note: George Martin has shrugged off the title more than a few times, and has also confirmed that Brian Epstein, to him, was indeed the Fifth Beatle. Just sayin'...)
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The Fifth Beatle is the title of a film in pre-production.  Brian Epstein was the flamboyant, brilliant, but troubled entertainment industry visionary best-known for discovering and managing The Beatles. The Fifth Beatle is a non-documentary feature film that will cover the last 6 years of his life. His story will unfold via a mixture of history, fantasy, allegory, dream sequences, and hallucinations.

Film Update: The Fifth Beatle
Recent Production Updates
 
Casting - The search for the actor to play the lead role as Brian Epstein continues.  The Casting Director is Kerry Barden, a partner at Hopkins, Smith & Barden. Kerry Barden has cast "Seven," "Good Will Hunting," "Shakespeare In Love," "Sex And The City," "World Trade Center," "Alexander," "Monster's Ball," "Chocolat," "Any Given Sunday," among other films.

Music Supervisor – Wayne Issak is the music director. He has been a producer of VH1's "Storytellers' series, as well as programs such as Eric Clapton & Friends in Concert: A Benefit for the Crossroads Centre at Antigua, Elvis Lives and VH-1 Where Are They Now: Former Childstars.

Production - Production Designer Gavin Bocquet ("Star Wars: Episodes I, II, III"),and Costume Designer Jany Temime (the "Harry Potter" films, "Bridget Jones," "Children of Men") are on board.

Classic Rock Central.com

2006 article in Rolling Stone Magazine about the film.

Eppylover Note on the above link to the Rolling Stone article:
Vivek has since denied that he told them "Beatles music would not be an element" in the movie. Of course he may use Beatles music! However, he does not wish to overshadow Brian's story with too much focus on the Beatles. There are many other fascinating untold or little-known stories in Brian's life other than his Boys ~ believe it or not!