The iOS version now has all the same features as its Android counterpart such as cloud saves, new weapons, the casino, new zombies and the survival arena. There are also a few bug fixes and tweaks in this new version as well. Some items should cost less than they were before, and some items should properly deal the correct amount of damage.
Madfinger also identified a bug that causes textures to be non-existent on the Lewis Machine Gun and the Brain-Mill weapons. A hotfix is currently being worked on.
Download Link [iTunes]