I have been looking for any information on these headsets. I currently own a pair of Tritton AX Pros and although I had a few issues with them, they are awesome at what they do.
Lot's of people have been looking for information regard the Warheads 7.1's and although Mad Cats/Tritton haven't announced anything regarding the release date and the price, a lot of websites have started posting the release date as the 15th of December with a price tag of $259.99
Not official, but if you're like me and have been waiting for these then hopefully the info comes in handy
Amazon (no price or release date)
CDUniverse (price tag $266)
Amazon UK (price tag £199 and release date of Dec 31)
NewEgg (price tag of $259.99 and release date of Dec 31)
Again nothing is final but it seems like the most certain date is Dec 15 with a price of $259.99 in the U.S.
As for the 12/31/2011 release date: A lot of companies do this when they are not certain when a product will be coming out, I'm sure they will update the date once they get an official date.