You may have noticed an update to Gmail in the Google Play Store. Those with phones probably won't be able to tell the difference between the previous version and this one except by version number, but tablet users – specifically those on Honeycomb 3.2 – will. This update brings the Android 4.0 Gmail features to Android 3.2.
Android Phone
See also:
at2359, Gmail for Android Update Brings Ice Cream Sandwich Experience to Honeycomb Users