Yeah I sent broonie a seed I found a while ago with the spawn in the new mesa biome, but he has not said if he is using it, it would be nice to be in or near that biome from the get go as it is very rare and with a limited border it may not even be available right away.
Broonie also mentioned larger biomes in the front page, does this mean the seed is with large biomes gen turned on? I am not sure this would be a good thing, especially since it would probably mean the rare biomes would be even rarer / harder to find given the limited border?