vegaslights
Brute
Since the show hasn't even been officially renewed yet, let alone actors signing on for another season, obviously anything about season 12 is all just talk, rumour, speculation, wishful thinking, etc. It's still fun to explore the possibilties though.
Exactly, it's all hearsay right now. Every year before the season wraps, the writers get together in the writer's room and kind of "toss the ball around" to see where things go in the following season. I'm pretty sure that's all that has happened right now. It's really hard to plot a season when you're not sure who you're going to have on board... as of right now all the actors are participating in contract negotiations.
When the show is renewed -- which, while it hasn't officially been announced, is kind of a given -- the writing staff will get back together (usually June 1) and start working on the season at hand. Production meetings usually start one or two weeks into July, and physical production (filming) begins around the third or fourth week of July. "Firm" (but still tentative) spoilers probably won't be coming out until late June/July... again, that's if the show is renewed officially.
As an aside, David Rambo is now on Twitter. You can follow him at @Rambopolitan.
(While he doesn't work on the show any longer, I still think it's worth pointing out. He wrote some fantastic episodes.)