This is actually a more important detail than it might appear because a number of the major publishers have a bee in their bonnet about OverDrive. Penguin and Simon & Schuster, have all entered (or re-entered) the library ebook market while at the same time refusing to do business with the largest library ebook vendor.
Luckily for us the vendors haven't been silent on this issue. Baker & Taylor, 3M, and OverDrive have each issued a press release which promised that they will soon make Hachette's 5,000 title ebook catalog available to their partner libraries.
There was no date mentioned for the 3M Cloud Library, but OD and Axis 360 will reportedly offer the ebooks on 8 May. None of the vendors have released details on pricing or availability, but I would assume that the prices will largely be the same. Hachette will probably set the prices and try to maintain a uniform price between the vendors. And as Hachette informed us yesterday, future ebook releases will be made available at the same time as new print editions, of course.