The scale of the craft is pretty impressive, as the video clearly shows. "With more than 5 million pounds of thrust at liftoff -- equal to approximately eighteen 747 aircraft at full power -- Falcon Heavy will be the most powerful operational rocket in the world by a factor of two," SpaceX notes.
Details of the mission are still sketchy, but Musk has said that the rocket will go into a "billion year elliptic Mars orbit" with a cherry read Tesla Roadster onboard as dead weight. Why? For the lulz, of course. "Test flights of new rockets usually contain mass simulators in the form of concrete or steel blocks. That seemed extremely boring," Elon Musk wrote last month.
Before that happens, however, SpaceX will need to static fire all 27 of the Falcon Heavy's Merlin 1D engines at once for the first time. A launch will only proceed if that goes perfectly, which is certainly not a given. Even if things do go to plan, there's still a pretty good chance, Musk has said, that the Heavy and Roadster will blow up before escaping Earth's gravity.