A conversation with Justin Fagnani about what's coming for LitHTML and LitElement. New directives seem reasonable. "Controllers" for reusable chunks of logic (similar to react hooks or vue's composition api?) look interesting. Support of dynamic generation of tags is cool too. Server-side-rendering support might be the most exciting feature, but it is still a ways off.
I'm sure this is something he will talk about at the next Chrome Dev Summit.