As of right now, Deus Ex: The Fall won't let you fire any guns when played on jailbroken iOS devices. Square Enix has confirmed to Joystiq today an upcoming update will allow all devices, jailbroken or not, full access to the game. The Square Enix statement sent to Joystiq reads: "We have not been clear in our communication earlier this week when we launched Deus Ex: The Fall. We did not state clearly that the game would not support jailbroken devices and so we will be switching this off via an update, so that all the supported iOS devices will be able to play the game in the near future. We feel it's the right thing to do in this situation and apologize for any inconvenience this may have caused. No customer should be out of pocket when we were not clear from the start, so we'll get the game updated as soon as possible so that everyone who wants to play Deus Ex: The Fall can do regardless of whether their device is jailbroken or not. As soon as this update is live we will communicate this via the Eidos Montreal Community channels"
Deus Ex: The Fall is available on the App store for $6.99 and is compatible with iPhone 4S and above, fifth generation iPod Touches, iPad Mini and third generation and above iPads.