It was announced a few days ago, and it's finally a reality - Visual F# Tools will be getting nightly updates. The proper announcement came in a blog post from the Visual F# team today, where they covered all of the most important information for developers who want to sign on with the new update model.
The Visual F# team strongly suggests that developers start getting the nightly builds, as they'll frequently be filled with important bug fixes and tweaks that will help tune the experience. If you want to learn just how to start getting your nightly updates - and to get an idea about what these updates will entail - you can check out the team's blog post. Enjoy!