There's another reason the test launch will be notable and that is it is likely to carry an unusual payload – a Tesla Roadster.
At the risk of being labelled an eccentric billionaire, Musk has teased that the first payload will be a red Tesla Roadster electric car (made by another of Musk's many companies).
While bizarre, it probably makes sense given that nobody is likely to want to risk an expensive satellite on an untested rocket that could very well blow up. If it doesn't Tesla will snare the prize for the world's most audacious marketing gimmick yet.
Much is riding on this rocket's success. While it will be wonderful if the first Heavy launch goes off without a hitch, many a launch of early Falcon rockets "went awry" until the technology was perfected.
They call it rocket science for a reason.