The track is taken from their recently-released second album Babel.
'Lover of the Light' will be released on December 3, and follows the release of live DVD The Road To Red Rocks on November 26.
The DVD features exclusive coverage of the band's shows at Red Rocks in Colorado back in August, and also includes documentary footage of the band filmed during their summer tour of the US.
Mumford & Sons' forthcoming UK and Ireland tour sold out in little over an hour, and the band recently announced a second show at The O2 in London.
Their return to the UK follows a tour of Australia and New Zealand, plus two dates at the Hollywood Bowl.
Details of two special-edition album and DVD packages have been confirmed.
A Gentlemen of the Road edition of Babel will also be released on November 26, featuring the deluxe version of Babel, The Road To Red Rocks DVD, and The Road To Red Rocks audio CD.
A Road To Red Rocks special edition package will be released on December 10, featuring the deluxe version of Babel, the standard DVD, a vinyl edition of the DVD, and a 96 page book of the band's Gentlemen of the Road adventures.
All special editions and the DVD are available to pre-order now through Mumford & Sons' official website.
Watch Mumford & Sons' music video for 'I Will Wait' below: