Join us in #mobile on Slack to ask questions and learn how to get involved. We do not hold a formal meeting but one of the team reps is usually available to answer questions weekdays 9:00AM Pacific,16:00 UTC. Mention a rep with the @username trick and we'll respond back!
This is the development blog for all the official WordPress apps, including iOS and Android.
How Do I Start Contributing?
The best place to start is the Mobile Handbook (draft). It gives you all the instructions on how to get set up with any app environment.