Like Final Fantasy XI, the game specs will be extremely high for the time, but in about 5 years, an average machine can run it on max settings with little to no issues. Tanaka also expressed interest in making a benchmark program available.
I will go ahead and say that new Imperial stronghold is a blast. There's a new storyline boss fight that's really fun (and difficult).
It involves a giant magitek boss that you need to kite around, generators that power a magitek transmitter you need to stop from summoning Dalamud. There's also waves of soldiers that come and try and stop you from doing said task.