Expansion Packs are usually always mainly behind walls.

ALL of FFXI's are,
Jobs? Go try to unlock corsair when treasures released as a brand new level 1.
Area? Go try to goto any Treasures zone as a brand new level 1.

Many of WoWs are
Go try to unlock Death Knight as a level 1 when Lich King came out.
Go try to goto Northrend as a brand new level 1.


Just play the game....