The Galaxy Tab 10.1 Ice Cream Sandwich update has already started to roll out on the 3G models, but now the Wi-Fi models are starting to get their turn. The GT-P7510 currently has an over the air update ready in the United Kingdom.
Hopefully, Samsung will release updates in other parts of the world soon too. It should not be much longer though because Samsung promised Android 4.0 updates by the end of August.
Source: Sam Mobile