The League of Legends website offers notes for an upcoming patch that will update Riot's MOBA to version 5.16 (thanks VG247). Here's a bit:

Welcome to patch 5.16, the one where juggernauts exist, defensive items get a pass and Zed actually gets buffed. Before we dive in, let’s clear some things up for all the esports fans out there - 5.14 (the one with crazy Elise, #bigsorry) will be the one that the rest of playoffs including the gauntlet will be played on. Worlds will be played on 5.18, which means while we totally hear you about these changes being pretty huge before worlds, we’ve set aside the next two to react and tune as necessary (read: lighter touches) before these changes hit the big stage.