No, no, I thought that too, but it's not like that.
They are adding some new modules that are LGPLv3 only. The old ones are LGPLv2.1, with an option to use LGPLv3, I assume. Hard to tell from their description without reading the legalese, but they'll need something like it, because v2.1 and v3 are incompatible with each other.
They are adding some new modules that are LGPLv3 only. The old ones are LGPLv2.1, with an option to use LGPLv3, I assume. Hard to tell from their description without reading the legalese, but they'll need something like it, because v2.1 and v3 are incompatible with each other.