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It can drive a 4K external display in addition to its own, so I guess two lower resolution displays in clamshell mode should be possible - if you can find the right adaptors.
 
I would say no without even looking. Than you are getting away from really what the computer is meant for. I almost waited for one, well at least the first gen.

I can see if someone wanted to use one as a extended or mirrored display once and a while. But if you want to drive two displays i would think that would be MBPR territory or even MBA. Just what i think at least.
 
I don't think it can because of the port, not because of the power. It only has one port; either HDMI or VGA with the adaptor. As far as I know, you need two display out ports to run two different desktops unless you're mirroring.

On my rMBP I need to use both thunderbolt ports to run my dual DVI monitors
 
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