Gearbox Software already announced its plans to release four Borderlands 2 expansion packs by June 2013, and a handful of developer resumes suggests that one of them could be called "Torgue." The discovery was made by web sleuth Superannuation in his(?) Kotaku column, with the resumes in question all belong to employees at Sorcery dev The Workshop.
Torgue is of course one of the weapons manufacturers in the Borderlandsverse, a company known in the latest game for the use of explosive ammo in all of its weapons. Superannuation posits that this is actually a codename, which would make sense given the series of elaborate titles used for the original Borderlands DLC releases. What's more, one of the developer resumes for an "unannounced" Borderlands 2 expansion indicates that the pack -- which may or may not be this "Torgue" -- offers more than 10 hours of gameplay.
None of this should come as a surprise for anyone who invested a healthy amount of time into the first game, but we can at least revel in hints like these while we wait for Gearbox to make a more formal announcement.