Well you open the .ipa, and inside is a few different folders, one of which contains textures/mesh, and audio, the others just contain data for the game and stuff. I looked no further than the audio since that has been my main goal, which I achieved aye.
If you want an in depth look, you're better off asking Omnitrix, deadpool, or just looking at it yourself.
The .apk is slightly different but I'm sure if you had a look at it you could swing it around. Currently I believe the LUA scripts have been loaded on Android (I could be wrong) and the audio replacements, I did on iPhone, although to fully get the Audio replacements to work, you will need either a cracked version of iTunes, or a Jailbroken phone,
Or IF YOU HAVE A MACBOOK, a copy of xCode so that you can resign the package yourself and inject the .ipa from there.
Hope this kinda clears things up.