I stopped by the Auburn, WA Games Workshop store last night (we're visiting family) and talked with the regional trainer who runs the store here. Apparently he trains the guys as far down as the L.A. Battle Bunker. Here's what he told me, and make of it what you will:
Plastic Trygon: Those pictures heavily debated on the intramawebs were not plastic trygons, they were the Forgeworld ones and a couple of conversions. He said it is possible for them to do but one would be years off.
New Plastics: The current Tyranid plastic line will not change, but the current metal models will eventually all be plastic. He said specifically they're working on a new Broodlord.
Release Frame: He said that Tyranids are not slated within the next 6 months, but possibly 8 months out.
He also agreed about my suspicion that Genestealers will be Elites with a Broodlord making them Troops in the next codex, but I don't take that as solid confirmation. He's probably seeing the writing on the wall just as much as I am.
The Auburn store actually has a life size Blood Angel in front, I heard that there's only 6 life size Space Marine statues in the U.S. I've seen the Dark Angel in the L.A. Battle Bunker of course, and he said there's another in WA, but couldn't remember where the others are.
Anyway, I don't consider myself a solid rumor source, simply look at my other rumors to see why. Today's rumor is not community commentary like that one, I'm just passing on what I heard.