This would be an interesting development if it turns out to be true. I would love to hear other people confirm this.
Here in California non-English congregations are a big deal. Huge in fact. The truth is though they can be a drain on English congregations as Saphhy pointed out above. I've asked other JW's about this and it makes for uncomfortable conversations because no one wants to admit it. I've seen it first-hand. Typically, the most zealous pioneers/elders in English congregations get bored with their non-productive English territories and move to an "exciting" foreign-language congregation. The English congregations lose publishers and are left with the non-motivated indivduals.
Often these foreign-language congregations are made up of mostly native English speakers. ASL congregations are an extreme example of this, only a small percent (less then 10%) of the publishers are actually deaf.