I hit upon an idea a while back, and it's been of great benefit for more than a few clients. I created a script that uses a show custom dialog notifying the user that button/feature is currently under development, with a simple 'OK' to close. It's allow us to put in placeholders while developing the actual script/layouts/etc. that will be part of the new feature or process. It lets the user to know that something is coming and where they can go to access it, and once we're ready, it's a simple script reassignment to engage the new code.
Don't know if anyone else uses something similar, but I thought it was helpful enough in our current projects that it was probably worth sharing.