I would wait So far I'm not $30 worth of excited about book 5 so I'm glad I got it for free from my dad. There is going to be a book 6 & a book 7 but they aren't written yet

So far in book 5 there's been chapter's for Jon, Bran, Tyrion, Daenerys, Reek (aka Theon Greyjoy), Davos. I think there's been others but I can't recall ATM. I'm at least 200 pages in & so far nothing much has happened. Does that help your decision?