The demo is mostly here:
A complete new implementation has been underway since roughly the beginning of this year. They called it v2.0 of mdl and has been under heavy development. Some of their designs is pretty nice:
https://github.com/material-components/material-components-w...
With the linked announcement they just renamed the mdl project to "material-components-web", nothing more:
https://github.com/google/material-design-lite/issues/4984
https://github.com/material-components/material-components-w...
I just cloned their new repo and started the compiled demos. I see no difference in behavior/design of the new components compared to the old mdl but the architecture is much more modular and can easily be used in any JS framework.