There has probably been newer info released on this, but I believe their original thought was Fall 2011. The POC line should be done somtime in late Spring and then they'll move on to Renegades.
My thought, just in time for season 2 of the cartoon to debut. If it makes it that far, I guess. I'm assuming since Hasbro is a partner in this network that even if nobody watches it, it'll still get at least 2 seasons worth of stuff on the air.
And, as an FYI, I don't get the Hub network and don't think there's an option available to me to get it. So, I won't be watching and by association, probably won't be buying any of the toys unless a vehicle comes out that looks cool. The figures, if they follow the animation closely, probably won't be of any use to me.