There has been some speculation that tomorrow’s NASA press conference would be about extra-terrestrial life and some speculation that it would relate to Saturn’s moon Titan. However, one plausible explanation comes from Sky Mania:
Our own investigations suggest that it follows a breakthrough in the discovery of microbes in a deadly poisonous lake that get their energy from arsenic. Experts say this shows they had a completely different origin to any other creature known on our planet. It means that life began not just once but at least twice on Earth.
Microbes that use arsenic as a building block? That’s crazy. Can’t wait to learn what the actual discovery is.