Hey everyone,
Everything said so far in this thread is pretty much spot on.
The process of updating is kind of a mess right now, since in retrospect I didn't really know what I was doing when I started a few years ago, and I've had to add several various hacks to it since then.
Actually uploading the new versions of the app to both app stores is relatively trivial, but getting all the files updated is the time consuming part.
Everything related to the app is open sourced on Github. There's a “readme” specifically for updating that basically consists of a bunch of reminders for myself at
https://github.com/numegil/MTG-Judge/blob/master/scripts/Readme.txt. As you can see, it's pretty terrible since a lot of stuff still needs to get done manually. I've actually considered rewriting all of the update scripts from scratch to make them as automated as possible.
So yeah, it would be awesome sauce if someone with the requisite code knowledge could either rewrite the update scripts, or figure out how the existing ones work. Once the updated data files are committed to the repository each new set release, I can pull the changes and upload it to Apple/Android.
As Mills mentioned, The MTG Guide app for iPhone is A+, it's what I've been using myself. As such, the Android version of MTGJudge is definitely a higher priority, though the data files are (almost) identical between the iPhone and Android versions. So if one gets updated, the other might as well too.
Feel free to contact me through here/email/Facebook/whatever if anyone has any questions :)
Thanks,
-Alexei