ArenaNet continues their rapid deployment of story content and new features this week with the arrival of Flame &Frost: Prelude, a new update that serves as a prologue to a multi-stage narrative to bring big changes to Guild Wars 2 (GW2) in the coming months. Along with new story content, the update also provides improvements to the achievements system with new currency and rewards, the Guesting feature to allow friends across different shards to group together, Unity Infusion and Ascended Amulets, and a number of other tweaks.

Patch notes for the update are available on the GW2 forums.

Sources: GW2 Flame & Frost: Prelude Page, Patch Notes