The link below indicates 4k pass-through is not supported.
http://www.eu.onkyo.com/en/features/4k-upscaling-76033.html

My Panasonic dual hdmi output blu ray has just died for the second time so I am now stuck with compressed audio via optical from the ps3 to Onkyo 805 for 3d movies. Could upgrade to a current 3d compatible receiver but would rather wait for 4k compliance which cant be far off if 4k up scaling is here.
It's unlikely you would be able to tell the difference between the higher bitrate lossy DD/DTS audio on BDs vs. HD audio over HDMI so you don't really need to upgrade for this feature only.

















The first Bluray with it has already been announced





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