I hear something about an automated system that has replaced tribunal

Completely true. :) See this post, "Where are the Tribunal reports going?" and the official announcement.

We’re going to temporarily put the Tribunal in maintenance mode while we upgrade the overall system to ensure players who deserve punishments receive them much faster than they currently do. We’ll also be adding the ability to review and reward players who exemplify the best sportsmanship in League of Legends.

In the meantime, a new system will hand out restricted chat punishments and game bans rapidly so players will be banned or placed into restricted chat mode within a few hours of their negative behavior. Improvements to another system, LeaverBuster, will tune and upgrade its ability to further address ranked play, ensuring aggressive and severe consequences to maintain the competitive, sportsmanlike spirit of the mode.