For anyone really desperate to update (and not already on /e/), the update OTA from A.091 → A.094 recently turned up in a logcat by accident:
To be clear, I don’t suggest using it, there’s no guarantee that it works, but it might be useful for somebody.
If you plan to and have a unlocked bootloader
And post those hashes in that topic (before updating) 
Or better yet, please dump the original recovery partitions beforehand, those would be great to help people that flashed TWRP by accident.