Seems like,

If people want a fully functional android wallet soon and for it to be released before other coins release one, it will probably need to be based on what is already open-source. If that is the case, then other people will be free to adapt it to their coins right away.

If people want a fully functional android wallet that is at least partially or temporarily exclusive to MintCoin, it will probably need to be built (more) from scratch and this may compromise being able to release it soon/first.