This thread shows what AOSP (pure Google ICS) apps are safe to replace Touchwiz Apps with on your Galaxy S III to get that Nexus/CyanogenMod type pure ICS look and feel (see screenshots below). These have been tested with S-Voice and it is still ...
I hate the stock calendar lol but the Google one doesn't seem to work anyways... Can anyone pull calendar from touchwiz and upload in didn't back mine up :/
Try this. I pulled it from my Titanium Backup
You can get it in the market but there are issues with double notifications. I have a post building right now under Themes & Apps that has the APK to move to System/App to replace the Touchwiz one. It will be up within an hour.