That's actually the best question submitted so far.
If you're going to help them prepare for an AMA, help them to prepare for hostility and baiting. They can answer the easy stuff off the top of their heads - they've been thinking about all this stuff for the past two years. But hostile questions could throw them.
We already have two big space games. Why build another one?
How do you expect to compete with Star Citizen and Elite:Dangerous with $300,000 and a part time team?
Does your entire game revolve around flying down to planets?
As friends of Derek Smart, do you also think Star Citizen is a scam?
You've been working on this thing for 10 years to get to the prototype stage. Why should we believe that you can go from prototype to alpha test in one year?
In the questions, assume that the asker is already convinced that INS or the product will fail and they're just looking for confirmation.
What's the meanest, cheapest shot that you think somebody could take at the team? That's what they need help preparing for. Especially questions that are cleverly worded, such as number 4 above. It just assumes that the team is friends with Derek Smart. If that's not addressed first, folks will assume that the team is and they will draw whatever conclusions they like from that, good or bad.