It seems that Pure Evil Miniatures are planning on releasing up to 20 miniatures on Kickstarter later this year. My wallet curses you Kickstarter!!
Initially only 7 were planned - Shape Changer, Lizard King and Panther, Bloodbeast (letf), Creature of Havoc, Zanbar Bone, Brain Flayer and Zagor the Warlock - but it seems that range may now be expanding.
With the vagaries of Kickstarter it will likely be up to the whim of backers as to what gets "unlocked"!
Side note: If you're not familiar with Fighting Fantasy it was a Choose Your Own Adventure-style book series by the co-creators of Games Workshop which rode on the Dungeons & Dragons wave of the early 80s.