I have no idea how valid this is, and it's just a rumor for now, but there appears to be a very slight possibility of a Weicker-Lieberman rematch in the cards.
Rumors fly in the comment section of this post.
If Weicker, who was governor from 1991-1995 and a U.S. Senator from 1971-1989 (when he was defeated by Lieberman in one of the strangest races in recent memory), did decide to come out of retirement, it would be a huge, huge story.
If Weicker ran as an independent, he would have no trouble raising money and wouldn't suffer for the lack of a political party behind him. He could resurrect his dormant A Connecticut Party, if he liked. Money and support would pour in from all over the state and the country.
If he ran as a Democrat (I doubt this), I think the convention would be sharply divided. Town committees have been expressing displeasure with Lieberman, even though rank-and-file Democrats seem to like him. It's hard to say how deep that support runs, though.
There are some reasons to doubt this rumor (I stess again, it's just a rumor!). Weicker is not a young man (he's 74), and I have heard that his health is not the best. He's also made noises about getting back into politics in the past, and nothing has come of it.
Still, the rumor is compelling. It would be the most interesting race in the state, and possibly the country. Weicker is a charismatic and highly entertaining political figure, and many people have fond memories of him as governor (myself included). He is also quite probably the only person who could give Lieberman a run for his money next year.