A report from Develop suggests that Blizzard may be working on a free-to-play game, if their anonymous source is to be believed. Details are sparse, but apparently the veteran studio plans to diversify its portfolio with a range of both subscription and freemium titles - and the mysterious Project Titan is still in the works.
Whether Project Titan is the free-to-play project in question remains to be seen, since Blizzard certainly has the capacity to develop multiple projects. But considering that they've already dipped their toes in the freemium model with World Of Warcraft (which is playable up to level 20 for free), this report certainly has the ring of truth to it. Watch this space.