The way the XOOM forced an OTA for 4.0.4 was to clear Google framework. When you go to the OTA it would say that the device hasn't checked for an update since 1969. It would force it. Someone should give that a try.
Acer ring is a new button in the midle of the taskbar, when you click it a ring shows op. In the ring you can change the volume, see your bookmarks, and some apps you put in it. And other stuff
The acer iconia a200 has it