It sounds like Teddy Kennedy is probably going to endorse Obama.
Caroline Kennedy has just endorsed Obama in a New York Times op-ed called A President Like My Father.
In my opinion, JFK is the most overrated president in American history (and yes, that includes Ronald Reagan). Nevertheless, I can see why Obama would want to associate himself with the myth of Camelot.
UPDATE: Apperently, the Clinton campaign really did not want this. From the Politico:
The Clinton campaign launched a last-ditch effort over the last few days to stop Kennedy's move, orchestrating a flood of phone calls to Kennedy from sources ranging from union chiefs to his Massachusetts constituents.
The former president also called Kennedy in a vain attempt to keep him out of the race, a source familiar with the conversation said.