Ask HN: What content should I show on Home page for a mobile web app?

I am planning to work on a mobile web app which might not have a desktop version(atleast not in initial stage) due to its nature. It would be a typical client/Server architecture. So far the mobile web apps I have seen are actually the trimmed down version of desktop web app hence people are usually aware about service. I am looking for guidance about content I could/should show on home page of my app.

Thanks