I would expect that they will do their own launcher--with a custom interface much like TouchWiz is a custom interface on Samsung phones. Apparently one difference between the Arc and the Vox is that the installed apps like Rdio can be uninstalled on the Arc.
The big question is whether the bootloader will be locked (like B&N and Amazon) or not.The Arc will have access to Google Play, and the Amazon and B&N devices do not.
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