He says the current models generalize dramatically worse than people:
https://youtu.be/aR20FWCCjAs?t=1501Then, he starts to talk about the other ideas but his lawyers / investors prevent him from going into detail: https://youtu.be/aR20FWCCjAs?t=1939
The worrisome thing is that he openly talks about whether to release AGI to the public. So, there could be a world in which some superpower has access to wildly different tech than the public.
To take Hinton's analogy of AGI to extraterrestrial intelligence, this would be akin to a government having made contact but withholding the discovery and the technology from the public: https://youtu.be/e1Hf-o1SzL4?t=30
It's a wild time to be alive.