On March 3, 2014 the band revealed the album's title War Eternal and the release date.
On March 17, 2014, Gossow released a statement announcing her departure from the group and welcoming her replacement, former vocalist of Canadian melodic death metal band The Agonist, Alissa White-Gluz. In the statement, she wrote that while she had enjoyed her time with the group, it was time for her to move on, be with her family and pursue other interests. Gossow did confirm that she would remain Arch Enemy's business manager, and would be "passing the torch to the super talented Alissa White-Gluz, whom I’ve known as a dear friend and a superb vocalist for many years. I always thought she deserved a chance to shine – and now she’s getting it. Just like I got that chance back in 2001."
White-Gluz also released a statement saying:
"I am very honoured and happy to announce a new chapter in my life and musical career. Wages of Sin was the first metal album I ever bought, and it was love at first listen. It is not often that you get a phone call from your favourite band asking you to join! I am thrilled to have the opportunity to work with such amazingly talented musicians whom I also consider great friends. I look forward to being able to write and perform at a whole new level now with Arch Enemy! Music is forever, metal is limitless and this is only the beginning!
The artwork for this album was created by Costin Chioreanu. Chief songwriter, guitarist and band leader Michael Amott commented about the artwork:
"I was looking for a hand-drawn feel with a unique atmosphere, something that would complement the music that we’ve been working so hard on these last couple of years. In the end my choice fell upon Romanian artist Chioreanu Costin, whose work I’ve admired for some time. Costin really grasped my vision for the artwork and layout, he’s delivered some of the coolest artwork elements we've ever had with Arch Enemy!
The first single and music video "War Eternal" was released on March 20, 2014. The video was the first of three produced and directed by Patric Ullaeus and his Revolver Film Company. The band will start their War Eternal world tour in May with an extensive run through Europe. A North American tour is planned for fall 2014, to be followed by more dates in Europe. As of May, over 80 tour dates have been scheduled so far. On May 27 they released their second music video, "You Will Know My Name". The third video, "No More Regrets" was released the same week as the album.
A fourth music video for the track "Stolen Life" was released on 5 May 2015 which was the first to include Jeff Loomis on guitar. The track is almost identical to the album version, but it includes 2 extra solos recorded by Loomis.