What we know now -- in either the books or the TV-show -- is all the information we have about them, as far as I recall.
In the TV-show, the wives burn down his keep and apparently prefer to be homeless in the Haunted Forest with winter coming. In the books, all we see is that they send off Gilly with Sam. The "feeling" you get when you read that particular chapter is that they stay to die, since "Craster's sons" are coming:
Gilly was crying. "Me and the babe. Please. I'll be your wife, like I
was Craster's. Please, ser crow. He's a boy, just like Nella said he'd
be. If you don't take him, they will."
"They?" said Sam, and the
raven cocked its black head and echoed, "They. They. They."
"The
boy's brothers," said the old woman to the left. "Craster's sons. The
white cold's rising out there, crow. I can feel it in my bones. These
poor old bones don't lie. They'll be here soon, the sons."
(End of chapter)
However, they seem resilient, and they have survived many years with Craster, so presumably there's a chance they survived. But that is speculation on my part.
The TV-show explored the aftermath of the rebellion where Mormont died, but the books did not. In a way, the TV-show ending of the wives' story is a more pleasant end, while the original ending from the books is -- in my opinion -- darker, and more realistic.
It feels to me like GRRM wrote the ending with just a hint of the doom awaiting the wives, and then left the reader not knowing how it ended on purpose. Both to accomplish this sense of reality, that you don't know everything that happens in life, but also to save himself of having to finish the story of what happens to the wives. And also of course, to leave a hint to the mystery of what Craster does with his sons. (Not a mystery in the TV-show, they revealed it)
Therefore, my personal hunch is that we will not get more info about what happened to them.
