It will mainly allow for easier and faster account creation, and for any app connected to the Steem blockchain to onboard new users. Right now, new users can only create accounts through Steemit.com, or one of the few paid account creation services, or directly through the command line interface, which requires some serious computer skills. When any app can onboard new users, we should see a lot more new faces around here, along with an increase in the value of Steem, hopefully.