They have launched a premium service, Robinhood Gold.
http://blog.robinhood.com/news/2016/9/28/robinhood-gold
I've emailed them and hoping to get a reply on the Australian launch.
http://blog.robinhood.com/news/2016/9/28/robinhood-gold
Robinhood Gold unlocks:
Pre & After Trading Hours: Once reserved for institutional investors, extended trading hours let you trade before the opening bell and well after the closing bell an extra two and a half hours of access, every day.
Additional Buying Power: Gold Buying Power is money that we lend to you to buy stocks, giving you the equivalent of a line of credit for the stock market. You get up to 2x your buying power so you can invest more, and keep any profits. More information on our Help Center.
Bigger Instant Deposits: Take advantage of Instant Reinvesting, which lets you access proceeds from a stock sale immediately, and Instant Deposits, which eliminates the three day wait period for funds to transfer from your bank into Robinhood.
I've emailed them and hoping to get a reply on the Australian launch.