The first single from Epica's The Quantum Enigma will be The Essence of Silence, as revealed on iTunes today. The cover ties in neatly with the art for the main album, as you can see from the thumbnail.
The single is expected to be released on the 14th of March in the EU and the 18th of March in the US. It is not yet known if it will be a CD single or purely a digital release. I don't know about you, but I'm very excited!