Yesterday Iron Maiden announced a free advanced download of a track from their upcoming record The Final Frontier. The track, El Dorado is the second to appear on the album slated for release August 16 worldwide. The album’s cover art (after the jump) was handled by long-time Iron Maiden contributor Melvyn Grant who was also responsible for work on Fear of the Dark, Death on the Road, Virtual XI and a few of the band's single releases.
Last time I checked the links there was a unavailable message due to extremely high traffic and demand for the song. You can try your luck at downloading the track here (US fans) and here (worldwide) or skip the registration process and simply listen to it above.