newbie Blu-ray audio decoding question

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My wonderfull wife spilled the beans and let me know she got a blue ray player. It's a Sony BDP-BX1 (http://www.docs.sony.com/release/specs/BDPBX1_mksp.pdf).

Now the question - This player does not have an audio decoder in it. How is this going to affect audio with my receiver? The receiver is a Marantz SR7300OSE (http://us.marantz.com/c_sr7300ose.pdf) it does NOT have HDMI, but it does have DTS-ES decoding.

Would an internal decoder be of benefit for me? Can the coaxial audio or optical even handle the new audio standards?

please help!

thanks!