Update: The phone has been removed from the U.S. Coming Soon page completely. It is still in the Global Coming Soon page, but the phone has not been added to the Products page yet.
The SonyEricsson T608 & T606 U.S. Coming Soon pages have been pulled. The link is still there along with the pics of the phones, but the page that loads contains nothing (a back link and an image – not of the phone).
I can draw two concusions from this, either the phone has been killed, or SE is about to move the phone to the Products section (as it is about to be released). I think both are true, as the T608 is about to be released, and the T606 is dead.