WKC 1 was pretty much a ffxi inspired game with multiplayer up to 4 player parties, and towns that you could create to group up (towns could hold more than 4 people). In this one you get WKC1 and all new upgraded gameplay with new gear, the continued story, and more. Now you can have 6 player parties and your avatar can summon a Knight (giant robot avatar to control in his place).
I'm gettinz this, mainly so I won't be tempted by ff14.
Live online gameplay
http://www.youtube.com/watch?v=ZK7J213hffk
http://www.youtube.com/watch?v=6F5AL6zB1RI
Online gameplay trailers.
http://www.youtube.com/watch?v=X7EXHPOr-7w
http://www.youtube.com/watch?v=MOsenOlpbRc