Update#1: The game is now launched worldwide. The people over at the forum thread link below are reporting that the game constantly download card art assets and uses up a lot of storage space on the device. I did notice constant downloading of card art assets on the computer version too so I guess it is part of the design. The space issue where card art assets steadily grow can be a problem if your iPads do not have much space left. Overall, I don't think the response in the forum were overly positive about the game. You can check out tips I compiled while trying out the Computer version here.
iOS App Store link