I'm not sure about causality, but it would seem to have ramifications for simultaneity, which since Einstein has been thought to be meaningful only within a particular frame of reference. Referring to simultaneous events across interstellar distances is supposed to be meaningless.
I don't understand the details, but that's what the theory is supposed to imply. Not sure where quantum entanglement fits in.
But all this stuff is beyond my feeble understanding of physics.