Is there a way to move a large file without "git annex unlock"ing it (Which takes very long for copying and then rehashing the file)?
Using a simple "mv" or "git mv" results in broken symlinks, if the target directory is on a different hierarchy level:

Example:

Initial State:

    $ ls -Hl Pictures:
    Pictures/showImages.jpg -> ../.git/annex/objects/90/32/SHA1-s8737--a8bfb285d0ae394cb75c86f1eb9f703fb678a51e/SHA1-s8737--a8bfb285d0ae394cb

Move: 

    $ mv Pictures/showImages.jpg .

Result: 

    $ ls -H showImages.jpg
    ls: cannot access showImages.jpg: No such file or directory