The 1.85GB 'Extended Cut' features additional scenes and an extended epilogue, better explaining the fate of Commander Shepard and his crew.
The free downloadable content will be available for European PS3 users on July 4. It releases on the North American PlayStation Store today.
Yesterday, BioWare admitted that the extended ending would add value and closure, but would not satisfy everybody.
> Download the Mass Effect 3: Extended Cut DLC from the Xbox Live Marketplace
Mass Effect 3: Extended Cut is the result of a fan campaign against BioWare and Electronic Arts.
Some users filed complaints against publisher Electronic Arts for false advertising, claiming that the game's endings were too similar.
While the UK's Advertising Standards Authority ruled the game was not misleading, the Better Business Bureau in the US ruled in favour of the fans.
Despite the controversy, Mass Effect 3 shipped 3.5 million copies worldwide during its first week on sale, making it the biggest entertainment launch of the year, according to publisher Electronic Arts.
Mass Effect 3 is available on Xbox 360, PS3 and PC. A Wii U version was also confirmed during E3, which will include all existing DLC.
> Read Digital Spy's review of 'Mass Effect 3'
Screenshot gallery - view Mass Effect 3 screens below: