Macmillan/St. Martin's Press is doing the same thing on at least some of its releases. If you look at the publisher's page on Fictionwise:
http://www.fictionwise.com/eBooks/ma...ooks.htm?cache
As far as I've looked (and I've checked at least a dozen of them), all the books listed with an original price of $14.00 here were released simultaneously with MMPB's released for $7.99. I've been trying to find a contact at McMillan in the ebook group to write to, but haven't had any luck so far.