Is it free?
Short answer
Nothing has been decided, because deciding pricing for a product with no users is a way of avoiding harder questions. If it launches, joining as either side will be free at the start.
The longer version
This question comes up inside a longer piece on the same problem. If the short answer above raised more questions than it settled, the full article has the reasoning behind it.
What Push & Pitch Is, And Why It Might Not Exist