Until that video comes out, you can read the proposal[1]. This appears to be quite recent (the timestamp says 4 days ago).

I personally found the writing style of the proposal to be clearer than the tutorial-flavor of the original blog post (I haven't watched the video). But that's probably because I have a programming language background and am intimately familiar with Rust.

[1]: https://github.com/modularml/mojo/blob/main/proposals/lifeti...