Hello Alastair,
Yes it is a card game.
As of right now there is no plan to release a plugin to the public. There is a potential for funders to become playtesters and have access to the Lackey Plugin that way. Right now it is a way for us to playtest across the world, no matter the time or place without having to print a bunch of cards.
After the game is released in card form, we will see how that goes.
Jonny