To make the transition easier, you can use provides= , conflicts= and replaces= in the PKGBUILD for the new package.
Check the man page for details.
The new package also has a much more reliable and applicable upstream link (Ubuntu, where Dell maintains this codebase).
Of course, people will have to uninstall the old package before installing the new one, this is explained in the comments section as well as the forum topic that is linked to this driver (https://bbs.archlinux.org/viewtopic.php?id=145884).
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