don't rush D3+ are coming in September for December delivery thats why bitmain is clearing the D3 batches 1 week after the previous sale. The D3+ will be 30gh/s simiar to innosilicon A5 but priced at $2199
I'd be interested in the source of this as well.
the history of the L3 and L3+ should be enough source to guess what'll happen next.