Blackwarder
Adventurer
I'll buy them, I like D&DNext, way better than 3.X or 4e, and I need to complete my D&D books collection 
Warder

Warder
I will definitely be buying, if anything just for completion, but I also happen to seriously dig 5th Ed, it's turing out to be what I wanted back in 2000.
Funnily enough, I think I would have been all over this if it had published in 2000 - after all, I do call it Advanced Dungeons & Dragons Third Edition - but it just doesn't seem to be the game for me in 2014 or 2015, whenever (if ever) it is going to be published.
As a collector I will certainly buy the Core-Books. By the way, do we know if there is again a Monster, GM and Players Handbook?
But these will probably the only books I get, since I really don't like how D&D Next turned out so far (maybe the final product is more to my taste, but I'm not very optimistic).