There's more. OpenAI also used the exhibition to show that Five could play alongside human players and learn from their play styles. And more importantly, you can play too -- OpenAI has started registrations for opportunities to challenge the AI (both in cooperative and versus modes) between April 18th at 9PM Eastern and April 22nd at 2:59AM Eastern. You shouldn't expect to win, but you'll have first-hand knowledge of just how good Five really is.
Not that it's perfect, mind you. Five still tends to prefer short-term strategies, and it's currently limited to playing by a narrow set of rules. It won chiefly because its initial bets paid off. Humans are still better at long-term decisions, and OG might have fared better if the AI didn't come out ahead early on.
This is the last planned public demonstration of OpenAI's bot, so you're unlikely to see more trouncings in the future, unfortunately. However, the victory suggests that Five is powerful enough to not only succeed in Dota 2, but other games with different mechanics. Powerful AI in games may be just a matter of time. Logically, the techniques learned here could also apply to robots and other non-gaming tasks.