I actually interviewed the author in August for our Rust podcast, on which he says he's waiting for async to mature before progressing further: https://rustacean-station.org/episode/001-ruma/
Thanks! Also, while we're here, let me advertise that this is not just "my" podcast, it's a community-based podcast that accepts audio files from anyone who wants to make any Rust-related podcast content but who doesn't want to go through the trouble of setting up a website, file hosting solution, podcast index integration, and so on. Contributions accepted. :) https://github.com/rustacean-station/rustacean-station.org/
Of our seven episodes only one hasn't been a product of me or Jon: an interview with Armin Ronacher about using Rust in production (https://rustacean-station.org/episode/004-rust-in-production...). Though we're about to publish our second externally-produced episode tonight, an interview with the creator of static site generator named Zola (née Gutenberg).
Plenty of people say tell us they're going to contribute, but you know how life gets in the way. :) We're not bothered by having a low-volume or irregular release schedule, this is just a fun side project for us.