Update: The Build 14393.448 (10.0.14393.448) is available now for non-insiders. Click here to read the official changelog.
We last reported about appearance of the Windows 10 Mobile / PC Build 14393.447. Now a newer Anniversary update CU build has appeared on the site BuildFeed that tracks internal builds under testing at Microsoft. The Build in question is Build 14393.448 and has been compiled on November 5th. So, it has been under testing for only couple of days.
— BuildFeed (@buildfeed) November 8, 2016
As the jump in Build number suggests (Build 14393.448 over last non-insiders Build 14393.321), there may be lots of fixes and improvements coming with this build.