If it is the case, I would say its a must that we get this one sold out with a massive marketing push. Free entry to season ticket holders and "friendly match rates" for the rest. We need to kick off life in the new stadium with a bang without just assumiing we'll get the crowds because we've a new ground.
There's normally the danger that people won't turn out in numbers for a friendly. It might not be the actual WCC, but imagine if we beat Manly!? What an acheivement that would be, and what a night we could make of it. It would also leave them shaking in their boots for when they play Leeds.