Once you have the main stuff loaded (the engine and sounds), you can play while its downloading the later levels. You're on level one, and its downloading levels 5, 6, 7 etc etc.
Take a lot of pictures (lots, everyone seems to forget to do that...of stuff we haven't seen much of...)
And ask if/when they intend on releasing the benchmark software thing they mentioned last year.
It is a generic message for all those people who seem to think we know how everything is going to perform on what hardware without even playing the game or seeing any benchmarks.