It seems like it could be "mini-game" related it just seems odd to make that comment during the Golden Saucer comment but as to what it would be, it's hard to say.

Odds are we will find out in less that 24hrs though during the live letter but for fun let's seee.

Maybe they decided to add a mini-game option for obtaining the items needed for novus or a concept which will be used in both animus and novus. If they went the minigame route maybe they are going to introdue "hot and cold" the XI style of finding buried treasure within a certain time limit and hitting it on the point.

If they did a card game that be neat, but I don't see them introducing something like that in a patch right now.