Where did you see that the 8th Edition was on pre order? As of now I am using the study guide and practice tests that are available as apps for the IOS. They were very reasonably priced for the two together as a bundle. There is no edition mentioned on them and I now can't find where but I think they might be updated. Not to the new April format but at least I have to assume more so / probable than the books.
Thanks I see it now. I read that the Sybex books should be available in May while the others in the 3rd quarter of the year. Depending on how far I get with the studying before then I might not wait for it.
How is the study guide of 8th edition different from 7th edition? Will the 7th edition be enough for clearing exams in 2018 and further?