Moshi Monsters Mash Up: Moshling Madness is set to release on September 5th, 2013. They have a bunch of new moshling cards, along with old ones. (EX: Linton , Hoolio , Splatter , Oddie , Lady Meowford )
Most stores started selling them earlier, like Tesco.
There are over 200 cards to collect, with new Holographic Cards, along with Mirror Foil and Rainbow Foil cards. Also, they have a special Moshling Card to redeem for a online moshling!