New save format,will it break plugins?

I am worried that the new save format (Anvil) will break multiworld plugins and terrain generators,do they need to be updated?

 

The new format is not something that particularly breaks plugins.
The changed height however will as many plugins have been ignoring the APIs available for this and simply hardcoded the height.

Well written plugins should continue working always they've always done.
The new format is an implementation detail the plugins don't have to concern themselves with.

 

Hope it wont break to many plugins. I'm most concerend with the conversion of old maps to the new format.

Tried to convert and old map I had with the latest snapshot and a large part of it was just destroyed by a gigantic jungle. Hope My server map wont get all messed up.