I am going to buy a Eizo 275w monitor witch is able to receive 10 bit signal via its Display port for producing billions of color instead of millions of color of old DVI port. My question is if rMBP can supply Eizo with 10bit signal via its thunderbolt(mini display port)?
Yes...it "could" but Apple has not put in the pipeline for applications to send 10 bit to the display. Photoshop can send 10 bit to the display on Windows...but not Mac. Talk to Apple and tell them you want it...