What we need to do is coerce a semi-reputable gaming news organization to claim that they have "inside information stating TESV will be announced at QuakeCon 2010". If Bethesda remains silent, then we know for sure it will be there. If they publicly dispute it, then we know it won't. Famitsu made an absurd claim that Bethesda has a surprise for E3, and Bethesda finally broke the silence affirming that they did not. Andy McNamara's tweet had the forum on the brink of revolt, and they said nothing... but no news source ever stated anything about this, we fed off our own imaginations.
The alternative is to do what we always do... wait and see.
Unfortunately, we are kind of left with the alternative unless anyone here can pull off such a scheme. I haven't any hope at all for a QuakeCon announcement, and it would really shock me if they did go that route. My training in the school of Mysticism indicates an October/November announcement anyway.