It's not clear what kind of changes this update brought as there is no changelog. Furthermore there is no AT200 entry on the Toshiba Support Forum as you can see on the picture below.
What can be said about this upgrade is :
- Android is still Honeycomb 3.2.1
- The Android Play (former Android Market) seems to work as it should, I mean like it behaves on all other devices
- Google Plus now works well. Before the upgrade, it didn't work at all beyond the first screen (Activity in Android terms)
- It seems the tablet is more stable since the upgrade