It may be hard to beleaf, but the Total War: Warhammer Wood Elf DLC is unleashed from the forests of Athel Loren today. As are the various free DLC bits and pieces that accompany it.
Creative Assembly have put together a bit of an overview trailer, covering the Wood Elf faction; its motivations, mechanics, army style, and Amber-gathering ways. You can see that, below.
In terms of additional stuff, the Empire gets a Jade (Lore of Life) and Grey (Lore of Shadows) wizard for free (find them in the Steam store to download). For those who already own the Beastmen DLC, there’s a new Legendary Lord to use: Morghur the Shadowgave. They also get Harpies added to their unit roster.