Inside the issue - which is available for just £1.99 on your iPad - Miller reveals that he and co-director Phil Lord (Cloudy With A Chance Of Meatballs) took a different approach to the Bat than Nolan and Bale.
“Our vision of Batman is very aware that he's a wealthy millionaire on top of being a super-cool hero," Miller says.
"Will Arnett brings a lot to the character. The character is a little bit more egotistical and self-involved than other stuff we've seen him in. But in the end, he's still a hero and does the right thing and is a badass."
The director adds that he met with Zack Snyder to make sure there was no cross-over between The Lego Movie and Warner Bros' own DC properties.
"We sat down with Zack Snyder and his team about it," Miller reveals. "I said we're making our own universe and they have nothing to do with it."
The Lego Movie opens in the UK on 14 February 2014.
For more from Miller, pick up the brand new issue of Total Film, which is out now, and includes an exclusive look at The Amazing Spider-Man 2, Godzillaand many more exciting new movies, plus chats with Zoe Saldana and Colin Farrell.
And because January can be a depressing old month, we've also got an amazing bumper giveaway. There's a FREE official Man Of Steel movie guide for every reader, plus three e-books (Nexus by Ramez Naam, Scare Me by Richard Parker and Blackwood by Gwenda Bond) courtesy of Angry Robot, Strange Chemistry and Exhibit A.
Can't wait to see Lego come to life on the big screen? Tell us below...