After the fiasco of the previous one informations 8.0.1 (reminded you of the updates of Microsoft?) Apple seems to have reacted quite quickly by making available to its disgruntled customers the new iOS 8.0.2. Probably some people did not sleep until the release of the new one versions.
The update can be downloaded via OTA and is relatively small. For Appliances iPhone 5S does not exceed 20 MB. Of course the update contains bug fixes.
It is already installed on the 5s
It is already installed on the 5s