Hello!
We would like to announce that we have extended the Android source code to support Ad-Hoc (IBSS) mode, when the driver supports it. Our changes fully integrate Ad-Hoc mode in the Android API and Settings UI. The relevant patches have been submitted to AOSP Gerrit and are awaiting review. We hope that Ad-Hoc mode can be properly included in future versions of Android!
In the mean time we provide CyanogenMod based images for Galaxy Nexus, Nexus 7 and Nexus S and more information here:
http://www.thinktube.com/android-tech/46-android-wifi-ibss. Please let us know if you have any comments and suggestions.
Bruno
(Thinktube Inc.)