Very sad news indeed, I think as time goes by the viability for the series diminishes. After ROTS was SW high point to launch this even two years after, but now if it ever does materialize I think the audience just isn't there anymore. Seems he's happy churning out that animated crap, don't get me wrong it's okay but I just can't get into it like I did the movies.
Also I honestly can't see why GL thinks it will cost too much to produce, Stargate has done 3 series with very adequate special effects, action, and stories.