I think media handling is key - whether for touch or desk. Video and audio are not going away but it's a bit tricky to handle much volume with the media library and uploads directory as it is now. IMHO, plugins are an issue as well. So many wonderful plugins but even with the forums and ratings, it's a bit of a crap shoot as to what will function as intended. I LOVE Wordpress and have used it to go well beyond a simple blogging platform.