That talk is fantastic! Just a note for anyone who's interested in Newspeak, it's more of a spiritual successor than a direct descendant of smalltalk (in a good way imo). It has some really slick features like:

* No global import/export namespace (all imports are dependency injected, meaning capability based security is already baked in)

* Nested classes instead of modules

* No variable assignment (everything is a method call)

* Mixins instead of inheritance

* Synchronization and code updates as near primitives

* Support for foreign objects through aliens and proxies, and foreign code can call newspeak objects through expats

* A native serialization to file format

* support for multiple overlapping type systems