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The latest primarch, and one of the most popular, has just been put up for pre-order on the ForgeWorld website.
Also up is Book VIII of the Horus Heresy series. This includes lists for the Blood Angels and White Scars as well as lists for Daemons. These books have a hefty price tag but so far the five I've bought have all been well worth the price paid. They are jam packed with background information on the armies in them plus narrative histories of the campaigns that they were involved in. Far more than just an army book or even just a game book.
They have released some Blood Angel cataphractii terminators too. I'm not too keen on these, mostly because of the shields. They already have a 2+/4+ save, it seems like some fire power might be more useful.
What does seem more interesting is the Blood Angel bundle with all the assault marines in it. 20 assault marines, 5 Destroyers, a moritat and a landspeeder for $355. USD It is a savings of about $50 USD vs. buying them individually.
I don't need to get any blood angels but it sure would be a useful addition to my World Eaters.