Joss Whedon has commented on the upcoming Firefly reunion at Comicon next weekend. Most of the article is stuff we already know (or that pertains to his work with Marvel) but the meat of it, and the bit you all care about, is this singular quote from the man himself:
“No matter how many years pass, I’ll never forget ‘Firebug.’ I can’t wait to sit once more with Washboard, KayMart, Rivet, the Hot Hooker from Homeland and Captain Kirk. Those guys are my family. Expect laughter, tears, faith-healing and Internet rumors about a sequel. To infinity, and prosper!”
Well, that's endearing, but it doesn't exactly give credence to the rumors that there's an announcement to be made. Again, nobody get their hopes up. Joss doesn't tend to play mindgames and he's not hinting at anything. Remain hopeful, keep sharing the joy with friends and family, and hope that some day we'll get what we want. But the chances of it happening at Comicon this year are diminishing.