Obama has been pretty consistent on this one.
Write up from 2009.
In the clearest indication so far of his thinking on the issue, Mr. Obama said on the ABC News program “This Week With George Stephanopoulos” that there should be prosecutions if “somebody has blatantly broken the law” but that his legal team was still evaluating interrogation and detention issues and would examine “past practices.”
Mr. Obama added that he also had “a belief that we need to look forward as opposed to looking backwards.”
“And part of my job,” he continued, “is to make sure that, for example, at the C.I.A., you’ve got extraordinarily talented people who are working very hard to keep Americans safe. I don’t want them to suddenly feel like they’ve got spend their all their time looking over their shoulders.”
http://www.nytimes.com/2009/01/12/us/politics/12inquire.html?pagewanted=all&_r=0
In 2009 his legal team was "still evaluating interrogation and detention issues and would examine "past practices."" We are now sitting here five years later wondering "if he will." We know he won't. You truly don't think he was aware of the information in this report around the time of this interview? I find that hard to believe.
I have my own opinion of why he won't do it. Much of it can be at this link. I personally feel this is the reason there is no chance of serious prosecution.
http://america.aljazeera.com/blogs/scrutineer/2014/12/9/torture-illegal-thennow.html