Today the folks at PhotoFast have revealed a 1-meter USB/Lightning cable for iPhone that also acts as a flash drive. Storage is located on the cord itself (in one end or the other) at 128GB, locally. This cord and its companion app have the ability to be locked using USB lock, App Lock, and Lightning lock - with Touch ID support included.
This cord works with its own PhotoFast app which tells you how much storage you have on your phone and on the cord at any given time. The cord isn't wireless (obviously), so you'll need to be plugged in to access storage. You can also run power and data through the cord as you normally would with any other Lightning/USB cord.
Connection: Lightning / USB 3.0 or USB 2.0
MemoriesCable U3 Transfer Speed (Lightning): Read 30MB/s, Write 20MB/s
MemoriesCable U2 Transfer Speed (Lightning): Read 5MB/s, Write 5MB/s
MemoriesCable U3 Transfer Speed (USB): Read 90MB/s, Write 22MB/s
MemoriesCable U2 Transfer Speed (USB): Read 24MB/s, Write 17MB/s
Compatibility: iOS 7/8/9, Mac, Windows XP/7/8/10
Size: USB 28 x 9.2 x 16.5 mm | Lightning 12 x 5 x 7.5 mm
Weight: 16 g
Supported Models: iPhone 5/5c/5s/6/6 Plus/6s/6s Plus, iPad Air/Mini
Supported File Formats
Document: Pages, Numbers, Keynote, doc, docx, xls, xlsx, ppt, pptx, rtf, txt, html, pdf
Image: jpg, png, bmp, gif, tif, tiff, ico, xbm, cur
Audio: mp3, aac, aif, aiff, wav, m4a, caf
Video: mp4, mov, m4v (without DRM), mkv, avi, flv, rm, rmvb, wmv, vob, 3gp
Above you'll see the specifications for this Lightning cable - they've got a patent register for it as well, so they're very adamant to mention on their webpage for the product.
We do not yet know what the cost of this cord will be, but it will be released in January of this year.