Borderlands DLC 4 Details Leaked

Details for the new Borderlands DLC have been leaked by Gearbox.
According to eagle-eyed spotters on the Gearbox forums the new PC 1.3.1 patch contains a number of files spoiling the majority of the storyline along with what we can expect to see for the new expansion.
**** MAJOR SPOILERS BELOW ****
The game will focus around a rouge army of malfunctioning Clap-Traps along with an army of familiar enemies who have been Clap-Trapped up.
Expect to see variants of Skags, Rakks, Psychos and Hyperion Soldiers all in Clap Trap styles. While you will be battling these new enemies throughout 21 missions, split between 9 main missions and 12 side quests.
Expect to see a wide variety of cast members, old and new, with some making a surprise return such as a Clap-Trap version of General Knoxx and a Undead Ned-Trap.
Ten different fast travel locations have been detailed with forum member Legendrew pointing out if this is true it will be the first time fast travel has been included in DLC.
We’ve contacted Gearbox to see if this truly is the new DLC for Borderlands. If it is expect an official announcement within the next couple of days.