Amazon to block Australian shoppers from its US website

I understand the physical/shipping portion of the ban, and why people would be redirected to amazon.com.au. Something that is substantially less clear, is how this impacts digital items, like Kindle books:

  - Can I still buy those from amazon.com, or will I need to get them from amazon.com.au?
  - If I need to buy from amazon.com.au, will that be subject to the same substantially reduced variety/options available?