I think the only reason Sony said it's interested in releasing the Interview online is to try to limit the blowback for having cancelled it's theatrical release. Sony probably won't release it online either, for the exact same given reason the theatrical release was cancelled: "nobody wants to stream it."
You can bet the hackers will resume their attacks if The Interview is released online, and my gut tells me Sony gave in because the hackers have data in hand that's far more damaging to the company than what's already been released.
I wouldn't be surprised if the movie was leaked online by someone who had worked on it, though.