The 1CGS/777 joint team published an update on their progress. The Yak.1b, scheduled for release this year, is now ready and into internal testing. It should be added to the game very soon. They also describe in lenght their effort into flight model research, especially regarding the MiG3 Landing behavior.
You can read more here : http://il2sturmovik.com/news/257/dev-blog-138/