And here’s the #1 lesson from my experience: If you are a small or medium sized publisher don’t have a news app. If you already have one, shut it down. Use your resources to make your mobile web site better. Kudos to The Atavist for making this decision.
A corollary: When major publishers do niche apps (NYT Opinion etc), they lose their built-in scale and become the equivalent of a small publisher for that category.