David Sirota writes on OpenLeft that he got an email written by Lieberman, forwarded to him by a fan that Lieberman still opposes the public option.
Here's what Lieberman said
A broad coalition is needed when addressing an issue as large, and as important for our nation's citizens, as health care reform. While, in general, I would prefer not to see a public plan option because of cost concerns and the possibility that it could potentially prevent the formation of the coalition that will be necessary to pass reform, I am very open to all options that have been laid on the table.
Now as Sirota notes, Lieberman did not say he would vote against a healthcare bill with a public option, so looks like he's got his finger testing the political wind again.