So far we have the main flow completed, and we’re able to set up an account, fetch folders, fetch messages, and display messages. We’re finalizing the outgoing flow in order to send messages, and after that we will start an audit to ensure that all the usual features you expect from interacting with your email are working.
Expect some future call to actions to test things and invites to switch the experimental pref ON.
There was something in one of the recent blogs about it also coming to Android, but I can't find it. Sadly though, it looks like it's months out, rather than weeks. Sorry to get your hopes up.