At Riot Games, we're committed to bringing you the best champions possible. Of course, quality champions do take time.
Riven, and the changes within her patch, will be coming next week. As we previously announced, Season One will conclude with our next scheduled game update. Therefore we will also be calculating the Season One Ladder rankings and rewards during downtime for this patch.
Additionally, there will be an extra week (3 weeks total) between the Riven patch and the patch to follow. This extra time will ensure we bring you the best content possible in League of Legends.
Thank you for your understanding and patience. See you on the Fields of Justice!