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Honestly, almost nothing works; everything is canned. However, we're in a good position to start a backend. While you will be able to enter text into text boxes and follow some (but not all) links, your actions will affect nothing. Furthermore, only a few events and profiles are implemented (events: chess game and basketball game; profiles: Bob Smith (you) and Sara Itani) - all other links will return you to the page from which you clicked them. However, no link should send you to a broken page.
In terms of what will change in the future, the high-level layout is set, but the details may change. For example, the finer points of the toolbar design will likely be much more elegant in the final version. We drew our inspiration from the lifehacker toolbar in this respect.