Silver has a couple of recent papers that probably give an idea of what they are up to:

>...Here we show that it is possible for machines to discover a state-of-the-art RL rule that outperforms manually designed rules. This was achieved by meta-learning from the cumulative experiences of a population of agents across a large number of complex environments... https://www.nature.com/articles/s41586-025-09761-x

and

>A new generation of agents will acquire superhuman capabilities by learning predominantly from experience. This note explores the key characteristics that will define this upcoming era. https://storage.googleapis.com/deepmind-media/Era-of-Experie...