Well from everything I've seen I have no interest at this time to buy anything for this release as there are no signs that Sisters got any support once again.
I wasn't asking for much here, just some rules and formations. There are no cards that seem specific to the Sisters from what I could see, and if there are any formations in the book they're strangely missing under the formations tab.
Well the Tesseract Vault, Obelisk and Lord of Skulls are usable by any and all armies! I'm personally adding an Obelisk to my Dark Angels, using this model:
Dark Angels Company Master | Games Workshop
See those things in the background? They're the Imperial Tesseract Vaults.