According to this little story, <a href="http://www.enterbf3.com/viewtopic.php?t ... 71742cdd68" target="_blank">BF3 will not be available via Steam.</a>
Interestingly, there is even going to be a version of BF3 available for mobile devices... <a href="http://www.enterbf3.com/viewtopic.php?t=2513" target="_blank">a snippet on this story...</a>