Guild Wars 2 might not be part of the festivities? Of course it is. Yes, ArenaNet has gone to Gamescom 2014, complete with chances for fans to win plushies, shirts, and Collector's Editions of the game.
The Gamescom events will also include the All-Stars Tournament event. If you're not attending the convention in person, you can still watch the matches on Twitch and follow the developers on Twitter to get in on the giveaway action, assuming you're not too busy with the latest part of Living Story content to notice.