Hmmm. Sword, diamond, rose and heart? So they have a card theme? I've been slacking on my Precure ever since Max Heart (only watching about 1/3 or 1/2 of each series since) but I always find myself looking forward to new ones.
The idea of card suits are also used in Fresh Precure!, but they're not as prominent as they are here. I don't mind the playing card/tarot theme going on here, but I'm not digging the character designs. Each girl looks random, and the curly hair is just ugly. :/
The stuff they're trying to collect might be card-based. It doesn't need to be a cure for every card.
I mentioned it on another pic, but I'd be down with a Sengoku Precure or a western-fantasy Precure. I agree that these designs are pretty general and boring. Let's hope their personalities and jive make up for it.