According to the online community, a hacker managed to access the Twitter account of Marc Merrill, co-founder of Riot Games. The hacker began posting images on a certain “League of Legends: Supremacy”, which was actually licensed some time back and reported on various websites.
As seen in the images, League of Legends: Supremacy is apparently an online card battle game, or TCG. Of course, none of the info is officially confirmed by Riot Games, with the whole thing possibly just a hoax… Just saying ๐