The folk band are currently working on the follow-up to their 2009 debut Sigh No More, with Ben Lovett explaining that they are nearly finished with the project.
"We are in the final stages, we're not finished, we don't quite know the exact tracklisting," he told MTV News.
"We have kind of road-tested some songs, and we have picked up some new songs and dropped some ones that people might have thought we were going to be putting on the record. We just want to make a record that's cohesive and one that we feel represents us best right now."
Lovett added that the group have yet to come to a decision regarding the tracklisting or the release date for the album.
"There just isn't [a release date yet]. We can't even say that any particular song is definitely on the record, because we just don't know. But we're being urgent with it, we're trying very hard."
Mumford & Sons will perform at this year's RockNess festival alongside Biffy Clyro and Justice.
They recently described their second LP as a cross between Nick Drake and Black Sabbath.
> Mumford & Sons release Big Easy Express tour film trailer
Watch the video for 'The Cave' by Mumford & Sons below: