Because Yii 1.1 has been widely used and it has received a lot of support from the community users, we decided to extend the end-of-maintenance date of Yii 1.1 to December 31, 2015. And if needed, we may further extend this date. This means we'll continue fixing important things, reviewing pull requests and answering questions about Yii 1.1, even after Yii 2 is released.