Yeah, I have the more expensive of the two current rMBP models. It ran the 4K monitor just fine once I'd updated to the latest OS X 10.9.3 beta (thus enabling 60Hz mode via HDMI). Running the MBP's screen and another screen at the same time didn't seem to cause any issues either.
Portal 2 ran OK-ish in 4K mode but I did have everything turned up to max.
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