Some trends I think will come soon from Amazon FBA:
1) When Amazon perfects daily grocery delivery it will change the whole ballgame for UPS and USPS. Amazon will cut them out of the picture. I think the cost of shipping furniture especially will plummet.
2) Amazon launched FBA Export a while back to let merchants fulfilling through FBA U.S. ship anywhere in the world easily. Right now only a few SKUs are eligible, but they are working to expand this program ASAP. In a year or two, a ton of products on Amazon U.S. will be available anywhere.
3) A lot of mainstream people don't know but Amazon warehouses don't just ship to Amazon customers. Merchants can enable multichannel shipping for a price ($6 compared to $2.50 for Amazon orders), so a lot of eBay sellers, Rakuten sellers use FBA to fulfill.