[Pre-purchase] Launching on 23 October worldwide, the official launch trailer for Guild Wars 2: Heart of Thorns was recently revealed by publisher and developer ArenaNet. Do note that NCsoft has apparently let ArenaNet function as an independent subsidiary, taking over the publishing duties. Other than new class specializations and maps, the raids feature is definitely the most anticipated.
Raids are a big piece of the puzzle for skilled players interested in taking on the ultimate challenges in group play. They will be 10-player instanced content where players must use newly acquired abilities to reach and overcome ever-increasing challenges, and eventually epic boss encounters. ArenaNet is releasing the first raid in three parts, or wings, shortly after the expansion releases.