Cool post. Thanks for taking time in writing it!
I wasn't aware of this new features.
It should require some time before we can be able to use this new features in libraries (for the sake of backward compatibility) but in our actual application code base it could be useful to have something like variadic functions and argument unpacking.
It will help us to avoid calls to `func_get_args` and keep our code shorter and cleaner. Well probably it's not the most common need, but it always good to have new ways to solve particular problems.