So I'm already breaking my promise (though this technically isn't a rumor, so I'm not really breaking anything), but I was looking at the Warstore today, and on their advanced orders page they have the Tyranid Battleforce listed at $105 MSRP with a release date of December 5th. I checked the GW site, and it is not listed there yet, so I have no idea on the contents yet.
This is a bit confusing, because isn't the codex supposed to be out in January? I thought that the battleforce would release around the same time. If this is the case, will new models be released in the battleforce? History suggests that they will, GW loves to show of their shiny new things in the updated battleforce.
Edit: Miniwargaming has it listed as well, with the same release date. I wonder if GW is getting in on the Christmas rush?
Most likely, this means that no new creatures will be found in the battleforce (I doubt they'd release a model without rules), but I'd guarantee that new plastic versions of metal models will be in the box. Methinks plastic Raveners?