Based on the novel by Charles Willeford
True story of the relationship between Virginia Woolf and Vita Sackville West
She'll be doing a voiceover role in the July 21 release
James Corden will voice Peter, with Rose Byrne as the live-action female lead
John Krasinski may also be leaving the film
Hugh Laurie also stars in the six-part John le Carré miniseries, premiering April 19 on AMC