It sounds like a recipe for failure on a few levels.
First, the product is not released to the public, so there probably isn't a large, established community asking to build a support site.
From the proposal submission form:
Please link to the organization or website where you will be organizing support for your proposal: If you do not have a community or organization to back your efforts, please do not submit an application for a site.
If a proposal author were to simply link to a product page without a sizable community organizing efforts to actively build a site, it will likely get closed before it gets started — minimum number of people for a successful proposal. Sending users passively to hit that 'follow' button doesn't work, and is typically a big waste of time for everyone involved.
Secondly, Stack Exchange is designed to answer practical, applied questions someone might encounter in their day-to-day use of this product. If the product is unreleased, the majority of example questions will likely entail:
- What is this [product]?
- What is it used for?
- How is it better than [x]?
- Will it have [feature]?
- When will it do [something else]?
Stack Exchange sites were not meant for product discovery and general evangelism. These example questions would likely be closed as
not constructive or
not a real question.
And finally, what you said about the uncertain future is true — drawing folks in to invest a lot of time, effort, and passion into compiling a knowledge base for a product which may never exist doesn't sound like a timely idea.
This application doesn't sound like a good fit for a Stack Exchange site.