Tom Hiddleston and Benedict Cumberbatch are friends, a fact which was plain when the duo were doing promotion for 'War Horse' back in 2011. However, when it was officially announced that Tom would be taking over Benedict's role in Guillermo Del Toro's 'Crimson Peak', Tom was quick to reassure fans that he got Benedict's blessing before taking the role.

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He explained to Buzzfeed, "The thing is we’re really good friends, and as soon as Guillermo called, I called Benedict and I said this is happening, and he was like, ‘Amazing!’ So, I had his blessing.”
He added that he's very excited for the movie, saying, "As these things do, they sent me the script about two weeks ago and it was a very new draft. I know Mia [Wasikowska], who I’ll be playing with very closely, and I know Jessica Chastain very well. I’ve met Guillermo before. And we are all admirers of each others’ stuff. And everyone said yes! I’m really, really excited about it. I’ll be shooting here in Toronto in February.”

Tom Hiddleston replaces Benedict Cumberbatch in Crimson Peak
The cast for Crimson Peak is still very strong, despite whatever creative differences Benedict may have had with the director. The film is tentatively set for release in later 2014 or early 2015.
Tom Hiddleston and Benedict Cumberbatch interview