Dual Monitor support without external video card I'm thinking about buying a MBP Retina 13".

Now I want to work at home on 2 Monitors, so the MBP will be somewhere under the table.
Is it possible to connect first Monitor via HDMI and the other one via Thunderbolt/MiniDP Adapter to DVI.
I believe so.

See this MacRumors forum post for a user with a similar need.

Sadly, I don't have a 13" Retina MacBook to test with.