As everyone is aware, Ice Cream Sandwich is a new version of Android, a combination of Gingerbread and Honeycomb OS. Anyways as far, for now the Samsung Galaxy Nexus will be the first phone to feature the Android 4.0 Ice Cream Sandwich.Android 4.0 Ice Cream Sandwich Features
are Android Beam, Android People App, Android Roboto, Capture Image during Video Recording, New Gallery layout, Built-in Photo editing, Built-in Data Usage Information, scroll to the left from homescreen to Open Camera, Slightly Improvements on Phone App, Gmail App, Calender App, keyboard App, New Web Browser supporting Desktop Sites and Saving pages for offline view, Face Unlock, and other GUI Improvements and changes.
Gabe Cohen from Google claims that most Gingerbread devices may have an upgrade to Android 4.0, claiming that it is theoretically compatible with any Android 2.3.x device. [Source: Wiki
And the million dollar question is, will it be available for the Mini ? (If Mini supports GB, then why not ICS)