Hmmm, I don't know for sure, but I think some time in 2014. Hope this helped. P.S- Some of these comments are hilarious, I mean, if you don't like homestuck, you don't need to read it. Also, why come to a forum called homestuck. You are not making anyone like it less you know.
The fact people are replying with "I hate Homestuck!" Wow. No one cares.
Anyway. It looks like June 2014 is the estimated date. I'm guessing it's going to be a relatively simple RPG thing? I guess like the older RPGs for consoles. That's the only way I can see them making it in less than two years.