Sony decided to close their online store on August 28. Full info can be read here: store.sony.com. All preorders will be fulfilled but from August 28 they will no more sell Sony products on their online site. I am yet not 100% sure but I also heard the same thing could happen in Sony European Stores soon too.
The reason for that is that Sony changed their sales strategy. They made big partnerships with major retailers and they feel it’s best for them to sell the products through them. I am not sure if that is a wise decision. But I certainly am not a marketing guy.