The most interesting is probably an app labeled FaceLock.apk. Google mentioned a long time ago that Ice Cream Sandwich would feature facial recognition, but we didn't know exactly how it would be used. This seems to point to one use as a way to protect your phone by using your face rather than a password or gesture to lock your device.
Another interesting listing is that the Books app is actually labeled BooksTablet.apk, which would lead us to believe that the Honeycomb version of Books is going to become the default for ICS devices. There is also a ChromeBookmarksSyncAdapter.apk, which seems fairly self-explanatory. There is also a mysterious PlusOne.apk, which could be part of the +1 integration with the Android Market, or could point to an expansion of +1 features throughout the Android system.
For the full list, just jump over to MyDroidWorld, and let us know if we missed anything interesting.