Facebook has posted a huge preview of the next version of its iPhone app. Due in September, Facebook for iPhone 2.0 will look and feel a lot more like the real Facebook. The News Feed will be exactly the same and profiles will use tabs and the combined Wall/Mini-Feed from the site's latest redesign. Perhaps more importantly, the functionality will be much closer. You'll be able to search for people outside of your friends, make/approve/ignore friend requests, and search your inbox and sent folder, for starters. Notifications will also arrive in real time while the app is running.