247 just posted an update... two small chunks...
"I can confirm that there are a pair of important Michigan-related figures that believe the chances with Harbaugh are currently very good. We've continually written about the potential flakiness of Harbaugh, and those caveats are going to remain until his name is on the dotted line in Ann Arbor. However, one source described Michigan's chances as "strong" late on Monday night, which is the most positive word we've gotten related to Harbaugh from them this entire process."
"Based on everything I was told tonight, and have gathered altogether, I'm willing to bump up the optimism meter a tad and say that I'm cautiously optimistic that Jim Harbaugh will be Michigan's head coach. I want to make it clear, however, that Harbaugh's flakiness, combined with the potential for teams like the Jets, Bears, Giants and Falcons to enter the NFL fray, make it far from a certainty at this point."
So basically... all of this optimism and tweets and such come from two Michigan people who "feel good" about the situation without any information on the dynamics on the other side of things with Harbaugh and possible NFL openings. I don't think the status quo has changed virtually at all except that they have an agreement on the table that Harbaugh's representatives have said is acceptable. Whether he actually takes it or not likely depends on what on the other side of things.