The press-release says "up to 128GB" while the price is a single figure of $3,000. So it won't be out of the real of possibility that the 128GB version would cost quite a bit more.
From what I've seen the general consensus is that the 128GB of memory is standard across all models, and that the price would vary for different storage and networking configurations. Their marketing materials say that "Each Project DIGITS features 128GB of unified, coherent memory and up to 4TB of NVMe storage."
