Kaz clears up the confusion
"[There is no] two SKU strategy in the US. We found out very quickly customers respond to just having one SKU."
"We dropped the price on the 60GB model, as you know that model is no longer in production. Once that model is no longer on store shelves there's just the $600 SKU."
http://atvs.vg.no/player/?id=10235