Doug Liman has taken time to explain why the sequel title of Edge of Tomorrow was changed to Live Die Repeat and Repeat. He said:
“So the book was called All You Need Is Kill. Japanese. I was making a comedy – an action comedy, and All You Need Is Kill didn’t feel like it was the tone of the movie I had made. The studio wanted to call it Edge Of Tomorrow, and I wanted to call it Live Die Repeat. I fought vehemently and lost. And then when the film came out and people loved it but the box-office wasn’t as good as it should have been, I really railed into the executive at Warner Bros who’d insisted that Edge Of Tomorrow was the better title.
“I was like, ‘It clearly is not. You were wrong.’ I committed the cardinal sin of telling somebody in Hollywood when they’re wrong, like, literally – I ended up having to call the person and apologize for pointing out that they were wrong. And they started titling it the title I always thought it should have, which is Live Die Repeat. But they tiptoed around it, and when we make the sequel, it’ll be permanently titled Live Die Repeat. The sequel will be Live Die Repeat and Repeat.”
“…We came up with an idea that we loved so much and that is so original – it’s why the sequel’s gotta have an even crazier title, because the idea’s so outrageous, and so smart and clever. It feels more original even than the first movie. Tom and I and Emily are talking about going back into the trenches.”
Source: Den of Geek