Hi Carlos,
Thank you for the kind words.
This may be by design - but the "simple update" function does not push the beta version to the remote systems. I have to manually connect and do the updates.
Yes, it is by design. This is to avoid accidentally pushing the beta to those who wouldn't want to participate in the beta testing.
Thanks for the feedback on other points. With regards to the mobile client - we'll do our best to implement this address book soon.