Riot Games is currently working on an unnamed MMORPG set within the League of Legends world of Runeterra, and while development is "going super well," there is no guarantee the project will ever see the light of day, according to the game's executive producer Greg Street.

Street took to Twitter a few days back to comment on how the in-progress MMO will be the fourth major project he's worked on, and will likely be the last. Street previously worked on Age of Empires III and World of Warcraft before joining Riot as a lead designer on League of Legends. Riot's MMO will be a "good final act," Street tweeted, assuming the game ships. While the team is optimistic, he makes clear nothing is set in stone.

Street goes on to clarify his comment in the replies, stating development on the MMO is going well, but that both Riot's standards and player expectations are high. As a result, Riot won't ship a disappointing game that doesn't live up to those high standards.