The mobile version of XF should probably just mimic that of Facebook, Twitter, etc. And I know a lot of people are going to hate on that. When you open up XF on a mobile device, the first thing seen should be a posting box that looks like the facebook app (no wysiwyg). Inside the box, it will allow you to just post text, post a photo(s), or photo(s) with text. When choosing photos the user could be prompted to choose whether it's a new thread or should go to the media gallery, or *gasp*, their own profile. For new threads, they would be prompted for a title and forum to post in.
Below the posting box should be the feed, configurable by the user, to either display all new posts for the day, posts by people they follow, posts in forums they watch, threads they watch, or any combination with preference on what they see first being allowed. With that, the OP and avatar/username should be displayed with some of the latest posts shown underneath and allows for displaying more posts asynchronously if the users chooses to.
In many cases, less is more...specifically on a mobile device. We really need to simplify the user experience there.