I'm really loving the Nasus changes on the PBE

Apparently his weapon will be able to transform and is a confirmed Darkin in form of weapon

For those who don't know on the PBE

When Nasus +6s melee champions his Kayn will be overtaken by Rhaast after +6ing enough which increases his passives healing greatly and miraculously causes wither to somehow knock people up

When he +6s enough ranged champions his Kayn becomes some shadow assassin-y weapon that deals bonus magic damage at the start of a fight, his W will instead be casted by a living shadow of him(so you can keep moving mid cast) and his ult will refresh the magic damage effect.

Overall pretty good changes for him.