http://arstechnica.com/news.ars/post/20060911-7715.html

Now, Sony is saying that it plans to allocate 80 percent of its US retail PS3s for the $599 "premium" sku, with the remaining 20 percent left for the $499 "core" model. The premium PlayStation 3 comes with a 60 GB hard drive, built-in Bluetooth and 802.11g wireless, and one HDMI output. The core model drops the hard drive capacity to 20 GB, has no HDMI output, and no built-in WiFi.