It is IMPOSSIBLE to take Biden's comments about the closeness of his relationship with Obama and the authority that his job conveys as anything but the sort of thing a guy who has made his mind up to run says. Biden has been around politics for a long time and knows what he is doing. And just in case you might miss what he is doing, he decided to pull in a random mention of secretaries of state -- that could be anyone! -- for good measure.
I have no inside information about what Biden is going to do or when he will announce what he is going to do. But it sure feels like his comments today amount to placing a marker on who will be the heir to the Obama legacy (and organization) in a race that Biden allegedly has yet to make his mind up about.