I'm seeing the odd post here and there from people that somehow got their hands on some of the Battle Sisters models saying they're a full head taller than Cadians. Sounds like they're about the size of the Sisters of Silence.
At first I was weirded out by it, but then I realised my existing pewter Sororitas are slightly shorter than Cadians so I think I'm okay with it.
It's the same with Commissar Raine. I think it's normal humans are a head taller now.
Personally I'm really not a fan. I liked the size difference between Primaris and humans.