- Bug #4018: AR relation eager loading does not work with db models (klimov-paul)
- Enh: Added support for using sub-queries when building a DB query with `IN` condition (qiangxue)
- Enh #3520: Added `unlinkAll()`-method to active record to remove all records of a model relation (NmDimas, samdark, cebe)
- Chg #2287: Split `yii\sphinx\ColumnSchema::typecast()` into two methods `phpTypecast()` and `dbTypecast()` to allow specifying PDO type explicitly (cebe)
- Enh: Improved `yii\helpers\Inflector::slug` to support more cases for Russian, Hebrew and special characters (samdark)
- Enh #3926: `yii\widgets\Breadcrumbs::$links`. Allows individual link to have its own `template` (creocoder, umneeq)
- Enh #4028: Added ability to `yii\widgets\Menu` to encode each item's label separately (creocoder, umneeq)
- Chg #2287: Split `yii\db\ColumnSchema::typecast()` into two methods `phpTypecast()` and `dbTypecast()` to allow specifying PDO type explicitly (cebe)
- Chg #2898: `yii\console\controllers\AssetController` is now using hashes instead of timestamps (samdark)
- Chg #2913: RBAC `DbManager` is now initialized via migration (samdark)
- Chg #3036: Upgraded Twitter Bootstrap to 3.1.x (qiangxue)