Dell has released the 2014.12 SUU, and it continues the tradition of expanding:

12/18/2014 07:13 AM 10,589,175,808 SUU_14.12.200.69.ISO

It is no longer sufficient to simply delete all the .exe files in the \repository directory if you still want it to fit on a single-layer DVD. You should delete all of the files in \bin\Windows and \java\Windows as well. This will leave you with 4,467,253,896 bytes, which is small enough to fit on a single layer DVD.

At some point in the future, unless Dell deals with the SUU bloat by splitting the Windows and Linux discs, you will need to use a double layer DVD, even with the Windows executables removed.