Board Thread:General Discussion/@comment-3070554-20130729205730

Grunkle Stan, Dipper and Mabel Pines will be back to explore the mysterious world of Gravity Falls for a second season. Disney Channel has renewed the hit animated series, created by young animator Alex Hirsch. (...)

A renewal comes as no surprise: So far in 2013, Gravity Falls is TV's top-rated animated series with kids 2-11 (2 million viewers), kids 6-11 (1.6 million) and tweens 9-14 (1.3 million).

Source

Alex Hirsch had already tweeted about it, but today TV Guide has officially announced the renewal! 