Over on the official Gears forum, Mark Rein had this to say:
This is a hoax.
We've already stated that we are working on releasing an update soon but we don't know the exact date of the release yet because it has not passed certification yet.
I wish the fan sites and online media would check with me first before they post stuff like this. Pretty much all of them have at least my email address (if not my phone number) and I check mail many, many times throughout the day