As I understand it, this is in development. I'm interested to see how he (Daniel Jalkut) solves the rich text editing problem.

I'm sure it can be done (for the majority of cases) without editing any HTML by hand. iOS has text selection, so text styling and linking can work the same way it does on a real computer. For things like image arrangement, that's generally done via CSS by applying a class that already exists. Doesn't seem like there are too many challenges, we just need someone to go and do it and make it look nice.