it is not functional yet, for now there is only an "image" (on a hidden, locked partition) which can be activated with a product key. only the started is functional.
there was some buzz in one of the articles that the pre-installed versions is "click-to-run" and they need to connect back to MS site often to get some data (is this true?) and a new disk install is better
i have done quite a bit of search on MS sites - they say i can can activate the pre-installed with a boxed product but don't say anything about un-installing...may be that is not needed.