Yii 1.1 support was originally announced as "Dec 31, 2015 (may be extended further if needed)". In March we've conducted a survey and since December is close, it's time to officially announce our decision.
Yii 2.0 has been a great success and even though there are still a lot of projects using Yii 1.1 we have to make a decision as our resources are limited. We have been focusing on Yii 2.0 development in the past year and there was not much activity for Yii 1.1.
We have now decided to not accept any features or enhancements for Yii 1.1 anymore. We'll close feature request tickets and related pull requests soon. As we also obviously do not have enough time to fix all the reported bugs ourselves we will review the open tickets and only keep the critical ones open. Most of bugs are open for such a long time that probably affected projects had already implemented workarounds anyway.
So here is the timeline: Yii 1.1 will receive critical bugfixes and PHP 7 compatibility fixes till the end of 2016. After that we will only respond to and fix security issues if any will be found until at least the end of 2018. Even after security support has ended, all the code and documentation will be still available.
If you have any questions or concerns about this, feel free to get in touch with us.