It looks like From The Sky Down will soon have its own DVD and Blu-ray release. The documentary is listed twice on Amazon.co.uk right now -- a regular DVD release and a Blu-ray version. Both are listed as being released already (well, November 21st) but with a note that delivery will take several weeks. Earlier this month, U2tour.de reported that From The Sky Down would be released on Blu-ray on December 9th. As of this moment, there's no DVD nor Blu-ray listing on Amazon.com.
From The Sky Down premiered at the Toronto International Film Festival in September. It's since been shown on various international TV and cable channels, and was also included in the Super Deluxe and Uber Deluxe versions of the Achtung Baby re-release. The documentary was shot earlier this year during the U2 360 tour and features U2 looking back at the making of Achtung Baby. (Thx Declan.)