Please remember that these are still "rumours" until the codex is actually released.
Via 40k Radio:
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Nothing special for Black Templars, you just get the full access to the codex. So you get Vanguard, Sternguard, Centurion and so on. You have the ability to put multiple power weapons in crusader squads. One is a non-character which can not be challenged. You get to hide a power weapon.
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EC can only be taken by BT and they're a HQ choice. [CrAzY424 - Obvious I would have thought].
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(Assualt Drills) S9 AP2 Melee, Specialist Weapon, armorbane.
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Castellans are gone. Vet Sgts are Sword Brothers.
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(Black Templar relics??) The relics consist of two swords, one bolter, set of armor, one storm shield and one banner.
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One set of Warlord traits for all chapters.
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Telion is the same points and all updated with sniper rules for 6th.
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Chronus is cheaper but still not worth it. Just increases the BS by 1
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CM has A4 and W4 and access to honor guard as command squad.
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Storm Raven stayed 200 points.
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Drop Pod back to (Capacity) 10.
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(Changes to Heroic Intervention) They do not get the penalty for disordered charge and Sgt auto passes initiative check for Glorious Intervention.
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(New AA-Tanks) AV 12 12 10 and no interceptor, I repeat no interceptor.
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Nice! Some of it may be repeats but It's all looking pretty awesome.