"They might not fuck it up"
I was very disappointed that the early rumours turned into real facts.
That said, they have given an undertaking that GitHub will remain autonomous like LinkedIn is and they have appointed Nat Friedman as the new GitHub CEO. There is the opportunity now for them not to completely stuff things up and alienate developers. Time will tell.
I would have still much preferred GitHub to have gone down the route of an initial public share offering since that could have avoided corporate dominance but that's history and a lost opportunity now.