Credit: Tushar Mehta / Android Authority
TL;DR
- Google is testing a new lectures Audio Overview style in NotebookLM that can turn notes into a single-host, 30-minute explanation.
- The Lecture format would sit alongside existing modes, such as Deep Dive, Brief, Critique, and Debate.
- NotebookLM is also teasing British English narration voices planned for 2026, with an early easter egg already live in a Featured Notebook.
As much as we admire NotebookLM, Google isn’t resting on its laurels and continues to tweak the AI app. The latest feature in testing looks to be a new “Lecture” format for Audio Overviews in NotebookLM, and there may also be a British twist on the way.
Instead of two AI hosts chatting things through, Lecture appears to stick to a single narrator delivering a continuous, lecture-style explanation that can run for up to half an hour. According to TestingCatalog, which appears to have enabled the feature in a teardown of the app, the Lecture option shows up alongside existing Audio Overview formats, such as Deep Dive, Brief, Critique, and Debate.