Join us in #wordpress-mobile on Freenode on Mondays, 9:00AM Pacific,16:00 UTC to ask questions and learn how to get involved. We do not hold a formal meeting but rather it's an open "office hours" time where one of the team reps will be available.
This is the development blog for all the official WordPress apps, including iOS, Android, and BlackBerry.
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.