Ulysses for iPhone Beta
Ulysses is a great app for writing. It's a super minimal version of Scrivener, with great support for Markdown. The app is already on the Mac and iPad, but Soulmen is planning on releasing the app for iPhone as well. The app is also getting an upgrade for the new iPad Pro. They are looking for 500 beta testers, you can apply with your device profile here.
I've been a huge fan of the app since it came out on the iPad. I reviewed that back in the Macgasm days. I'm excited to see how it works on my iPhone.