(add 3, 9:35 a.m.): Buster Olney reports that the A's are paying $1.5M of Holliday's remaining salary, leaving the Cardinals on the hook for approximately $4.5M.
More updates in this post forthcoming.
(add 1, 8:35 a.m.):
Here is a link to Kurkjian's article.
Here is Peterson's complete college and minor league statlines.
Here's Mortensen's stats.
Here's Brett Wallace's.
(Those links are to thebaseballcube; to see pictures of Mortensen and Peterson, as well as their split stats, click on the two links provided by flipgatey in the third comment below).
(add 2, 8:50 a.m.):
Buster Olney echoes Kurkjian's information as well, including prospects coming in return: Wallace, Mortensen, Peterson.