Well, last week, you got the army book. That means that this week you get the new releases for the faction. If you're looking to pick up the new Ossiarch Bonereapers, you'll want to meander to the Games Workshop website to get your order in. Halloween may be over, but skeletons are in season all year 'round.
From the website:
Grab all of this week's awesome new Ossiarch Bonereapers models with the click of a button. From necromancers to heavy cavalry and from artillery to monstrous creations, this is the perfect way to get all of these new models.
– 1x Katakros, Mortarch of the Necropolis
– 1x Arch-Kavalos Zandtos (can alternatively be built as Liege-Kavalos)
– 1x Gothizzar Harvester
– 1x Kavalos Deathriders
– 1x Mortek Crawler
– 1x Mortek Guard
– 1x Mortisan Boneshaper
– 1x Mortisan Soulmason
– 1x Mortisan Soulreaper
– 1x Necropolis Stalkers (can alternatively be built as Immortis Guard)