There is a rumor floating around that GW2 will be making an appearance at GamesCon. Both the site are in German, but here they are. http://www.wartower.de/news/news.php?id=3326 and http://bit.ly/360K6l Now the specifics are not knows, what is known is the German division of ArenaNet is going to GamesCon this weekend. "Our Community Managers have mentioned in the forums that we will have a small number of staff there, including our German CM. =)" ArenaNet tweeted. As well as "Looking forward to Cologne: http://yfrog.com/7btbej " and "We will have GW2 stuff to share pretty soon." Now this could just be a wash by I personally received two tweets one from ArenaNet and one from NCSoft.
"@Jamion We've been telling folks for a couple months that there will be GW2 info later this year. :-) So stay tuned and sit tight." From ArenaNet
"@Jamion Thank you for your concern Jamion. We will do our best to make Guild Wars 2 a great game. Great games need great users like you :P" from NCSoft.
I think the lack of, "no we aren't going" speaks volumes. It could be a wash, but I have my fingers crossed that we will be seeing GW2 at GamesCon next weekend.