I know it's been discussed a little before, but rather than necro bump a year old thread I figured i would just start a new one. I still haven't seen or read anything about any card games or mini games being implemented. I would really enjoy having something like triple triad or tetra master or even like a board game of some sort that doesn't require logging out to play. I'm not suggesting those EXACT games, but something similar. Something that is quick to play, easy to learn, and has some strategy to it. Need something to do while waiting for a couple party members? Play some cards.
Also the collection factor would be fun if you could trade/sell cards between players. Maybe a vendor that sold random packs of cards. I have played TCG's before and half the fun was the opening of new packs to see what goodies you got, and trying to complete collections.
However I would not want any kind of game (card game or whatever) to be a necessary to player's progression in the game. If you don't want to play or collect it will in no way affect your progression. I just think it would be another fun and addictive feature in the game, and a great way to kill a couple minutes of downtime. Not to mention a little sub-economy in cards via trading and collecting would be kinda cool.