The PS3 is going to be upgraded and will offer 3D capability, agreed, but there's nothing physically different between the various generations of HDMI, so it's not beyond the realms of possibility that the 3D-upgraded PS3 will effectively have an HDMI 1.4-spec output.
Unfortunately upgrading a receiver to offer HDMI 1.4 passthrough is rather trickier, and it's our understanding that there are no manufacturers planning such upgrades to receivers.