Borderlands 2′s Skill Tree Builder is now live. It allows players to plan how they want to spec their characters out ahead of the game’s release. Some functionality updates will be released next week, said Gearbox. The developer has posted instructions on the official Gearbox forum. Borderlands 2 releases on September 18 in the US and on September 21 in the UK for PC, PS3, and Xbox 360.