I gave the esPass talk in a longer form with more detail at the Berlin Ethereum meetup in January.
This is a recording of the lightning-talk about esPass from the 33c3:
You can now download esPass files for the 33C3:
K-9 from version 5.111 now supports espass mime-type.
The espass media-type was accepted by iana. You can now find it here: http://www.iana.org/assignments/media-types/application/vnd.espass-espass+zip
Over one million downloads - soon 500.000 active installations.