According to an App Annie's blog post, here is a summary of interesting App Store stats.
- Revenue per download: 37 cents in Norway, 22 cents in US, 4 cents in China
- Fastest growth of downloads: China +298% with revenue +187%
- Apps with In-App purchases monetizes at 2.2 times more than those without In-App purchases.
- iPad download increases at +200% growth compared to iPhone at +70%
- iPad generates 2 times more revenues than iPhone
In other words: build iPad apps with In-App purchases and make them localized for China and Japanese.