It transports you back to the battle of Ostagar, where the Grey Wardens got beat, with new armour and a second shot at the dog companion.
How much will this extra goodness set you back? Well it will cost £3.99 on PS3, 400 MSP on Xbox 360 and 400 BioWare Points (BWP?) on PC. The latter two translate into £3.40 and £3.10 respectively. Will you be returning to Ostagar, videogamer?
Source: Eurogamer