According to data miner who unearthed the listing from Steams database, Borderlands 2 Game of the Year Edition is coming soon but when is the right question.
via N4G: pc news feed http://n4g.com/news/1304268/borderlands-2-goty-edition-listed-in-steam-database
via N4G: pc news feed http://n4g.com/news/1304268/borderlands-2-goty-edition-listed-in-steam-database