Finally there is a great lead regarding Overlord Volume 12 Updates!
The most reliable source found is from Amazon!
You can pre-order it with the link below but it is in Japanese:
Overlord Volume 12 Updates
The title for the volume 12 is “オーバーロード12 聖王国の聖騎士” (Volume 12: Knights of the Holy Kingdom)
For the thing that everyone is waiting for, the release date!
There might be a delay but it will be around that period so prepare yourself for Overlord Volume 12!
We will finally uncover the real reason for the “death” of Ainz!
While waiting for the release of Overlord Volume 12, can read some fan fiction that Overlords fan have wrote Here