Borderlands 2, the last of which is due to arrive by June 2013. According to the publisher, each DLC pack will include several hours of gameplay with new adventures, allies, enemies and environments in each.
Each pack will cost 800 Microsoft Points ($9.99 USD), but Gearbox will be releasing a Borderlands 2 Season Pass to get all four packs for 2400 Microsoft Points ($29.99 USD) which will offer a 25% discount, effectively making it a "buy 3, get 1 free" sale.
The first expansion isto include a new class, the Mechromancer.
Borderlands 2 is due to be released on PC, Xbox 360 and PlayStation 3 in the 18th September in North America and the 21st September in Europe and the UK.