Well, as you know, I have some "experience"
with splitting books.
Generally speaking, when you split a book that's because
a) It is large enough.
b) You want to win more money with it.
History concerns, viewpoints, climax and endings is no concern for the guys who decide to split the books. So, as Ryos said, the endings will be blunt. they would probably end when there is a big viewpoint and story jump (there should still be some stories going on separately unti they gather in TG).
Of course, with BS and Harriet pressing to keep it as whole as it can, maybe they try to fins some way to split it coherently. We may have some hope.
Anyway, this seems to me as a premeditate "leakage", something to test the level of rejection people have towards the splitting. I believe they will do it anyway, but maybe if there are riots and a worlwide general strike, they decide to release them every 6 months instead of 12.......... yes, that's irony, I think they will go ahead with this and to hell with everything else.
I just hope protests make them reconsider the price. As I convinced my wife to stop buying the translated books, we bought all 3-11 books in English paperback, and they went for around 10-12 $, I don't remember exactly. Now, one paperback book would be 66 $...... no good, not really good.