Thanks to the 3 month-old anti-trust settlement, the US ebook market is getting more and more complicated. It's a pity that I cannot say the same for the rest of the world, where agency pricing still holds sway.
It's been just 5 days since Hachette ebooks lost their publisher imposed fixed prices, and a day under 3 months since HarperCollins did the same. All these changes to pricing policies are a result of Judge Cote approving the anti-trust for the anti-trust prosecution in September of this year.
Earlier this year the US government (as well as 49 state gov't) sued 5 publishers and Apple, accusing them of colluding to fix ebook prices. Three of the publishers have settled, and as of today they have all changed their ebook pricing policy to release ebookstores from the pricing restrictions.
Apple as well as Penguin and MacMillan have decided to fight it out in court. That case won't go to trial until June 2013.