I carefully tested the new templates in single-player.
1. Boomerang is very similar to Diamond, only with longer (as it seemed to me) paths and fewer resources. Therefore, it doesn't seem very useful to include it in a pool of 5 templates when Diamond is already in that pool.
2. Cerberus is a very interesting thing, completely new, but at first glance, it seemed that games on it would be the longest on average of all the HL-lock templates.
3. I think Black and Blue is the best candidate for a quick tournament test – it's an excellent template! Something in between Jebus L, CM, and some others. It doesn't seem like a "money template" at all; there are many different strategies for the game, and not just a simple "go for GO." Plus, the new objects on the stack of wizards look very interesting.
The point is that players who prefer to play mirror templates will play them, and for the rest, there will be a draft with the possibility of switching to a fun template.
Added 1 minute ago
3) All games count towards the rating (I'm too lazy to clean up the list of games :rolleyes:)