Details on Phantasy Star Online 2 have being dropped via an event held by Sega. Details for the game according to 4Gamer:

• Is there adventure in today’s RPGs?
• Always, to a new field. Random field.
• Original Combos
• TPS style
• Jump Action
• Hybrid Custom Action
• It gives you a foreboding feeling — seamless weather.
• Something will happen every time!? Interrupt event
• Aiming for “Endless Advneture.”
• The adventure without end, once again.

Along with details 15 screenshots were released from the official site:

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Phantasy Star Online 2 is currently gearing up for alpha.

Source: 4Gamer