http://terrafirmacraft.com/change_log.html
So, these changes will only apply to new chunks within the current world, that means if we want to have a seamless world and apply these changes, we'll need to reset the world.It is recommended that you create a new world when playing 78.10 to get the full effect of the changes, but is not required. Since 10 changes a number of worldgen settings and makes trees spawn properly where they weren't before, there is a fairly noticeable difference in worldgen between this and previous versions.
What's your opinions on doing this?
Please note, I will not reset the world without getting a large enough amount of Yes votes.