My question was answered as follows:
Dear (r) Mr. XXXX,
thank you that you have turned your concerns, with regard to the Sony Blu-ray Player BDP-S480, to us.
Due to an unusually high volume of e-mail we ask the delay, to apologize to the answer of your inquiry.
Playback is at 60 Hz, as this is the standard we use. Another reason we can not give you.
We appreciate your patience and are available, for further inquiries, at your disposal.