New iPhone, iPad and Mac versions of Decked Builder have been submitted to Apple. You should have New Phyrexia available on your device soon -- including support for the new Phyrexian mana symbols.
In addition, we have been working overtime to generate new mana symbols due to legal issues. Because of the short time frame, we have gone with a minimalist look for now, using simple circles and colors for the new mana symbols. If anyone wants to contribute, we will be more than happy to accept submissions for new mana symbols.
Check out the new look below.