If you have Google contact syncing enabled in 10.7.1 or earlier, then upgrade to 10.7.2 and try to enable iCloud contact syncing, you will see the following dialog:
Is it possible to have both worlds? I would like to sync with iCloud for my iOS/mac devices, but ALSO sync with google for my gmail/android devices. This used to be possible with mobileme.
Best Answer
Doesn't look like this is presently possible. Only way to get this to work is use Google Contacts as the main source, and then set OS X Address book to sync to Google, and use Google ActiveSync on the iPhone to also sync contacts with Google.