Just in case you haven't heard, NASA has offered up a press release saying that Thursday December 2 at 2:00 pm EST, they will have a discussion of "an astrobiology finding that will impact the search for evidence of extraterrestrial life."
It will be broadcast live on NASA Television and streamed on the agency's website at http://www.nasa.gov.
Sure, everybody has a hunch. Mine is an announcement of microbial life confirmed on Mars.
Other speculations, Saturn's moon Rhea has a thin atmosphere of oxygen and carbon dioxide. That means it could support life.
Look, in all honesty, one of the first things you learn in science is to follow the evidence, rather than drag it to where you want to go. But still, its fun to speculate.
Update: Nothing new to add, but Phil Plait over at Bad Astonomy has a lot to say about half cocked speculations. As always, his stuff is the standard by which we measure ourselves. Or sometning....