Please remember that these are rumors, and TastyTaste is answering with the best knowledge he can. He just gave us a major rumor drop with tons of information. Knowing every specific bit at this point would seem difficult at best. In other words, he is answering what he can.
TastyTastes previous Chaos Marine Drop
via TastyTaste on Blood of Kittens
So does Soul Blaze replace the AP3 on 1k sons bolters, or is it in addition to it? And since rapid fire weapons can be fired on the move now, do they still have SnP?