GToolkit is also an exciting new development that's happening in parallel with the mainline Pharo. This is a reimagined programming workflow for Smalltalk with new UIs for coding, debugging, documenting, example browsing, testing, etc.
Likely the best bits of this environment will be cherry-picked into future Pharo releases, but meanwhile it is available here at https://gtoolkit.com/ and I for one am building an application on it.
Are there any screencasts or similar videos out there? Looks promising but it probably "clicks" more if you see it in action with a more complete example.
I'd recommend downloading and starting it. It opens into an interactive "notebook-like" tutorial. The system is very discoverable. Has a markdown-like syntax where you can embed Smalltalk objects and code examples and interact with them directly in the page.
Likely the best bits of this environment will be cherry-picked into future Pharo releases, but meanwhile it is available here at https://gtoolkit.com/ and I for one am building an application on it.