Slipstreaming is a term used to describe building/releasing a new version but not changing the version number. What build you get depends on when you download it.
It seems that Kovid dropped the new build in the normal places sometime on Saturday.
If you installed the original 0.8.0 and can't wait for the 0.8.1 release later this week, then you must download calibre again, uninstall the current version (uninstalling won't delete books or preferences), and then install the newly-downloaded one. The uninstall step is crucial; without it the new version won't install. If you wait for 0.8.1, then the uninstall step is not needed.
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