Kent Anderson has published "Macmillan + Springer: Some Lessons to Learn, Some Twists to Watch" in The Scholarly Kitchen.
Here's an excerpt:
The competition this merger creates at the top of the market—turning a two-billionaire race into a three-billionaire race—is unlikely to trickle down in any helpful way. More Big Deals will leave fewer scraps for others. Some top-end titles may benefit from the increased competition on the acquisitions front, but I don't think a general bidding war will break out.