Way more than that! Currently it's mostly for witnesses, developers and "power users" who are able to play with hived and cli_wallet, but over time it will grow to be a playground for everyone to tests their apps before going doing the same in the real world.
I had not much time for writing so I tried to keep it short and simple with maximum useful information condensed. You can use mirrornet to test everything Hive-related in the environment that resembles real Hive as close as possible.