Read more at: http://www.hitfix.com/whats-alan-watching/game-on-hbo-will-offer-standalone-streaming-in-2015
They're being sketchy on the details, which probably means they'll be some limitations and/or restrictions. Alan Sepinwall (television critic) notes that the HBO chairman didn't specifically mention the HBO Go service in this announcement, which seems intentional.
The pricing will obviously be a big deal. Netflix has more options to draw from, so you would think HBO would have to be under their pricing numbers.
Edit:
On the heels of HBO's announcement, CBS has launched their own all access streaming subscription service. It's $5.99 per month.
The subscription includes:
-Full seasons of 15 current CBS shows. New episodes available the day after they air.
-Full past seasons of 8 current shows
-More than 5,000 episodes of classic series from the CBS library (Cheers, Twin Peaks, Star Trek, etc.)
-No NFL games (Nice try, suckas)