One of the plans for Modern20 from the beginning was that it be a "living" game, growing and changing over time as countless players and game masters stress-tested the game and pushed it to its limits.
Now, after GenCon, the first major revision of Modern20 will come, adding 15 pages of new material to the core rules. And better yet, for those who have purchased Modern20 already, they will be able to update their book to the revised edition for free!
More information on Modern20 Revised will be available after GenCon, so stay tuned!