Look, if I go and buy new books this year and next assuming they will be compatible because they say "It's 'Just D&D', it's the same edition" and then find out that some of the mechanics are no longer applicable, and others need to be reworked, then yes I will be vocal to say that they lied - and correct to do so. Because they made a statement and it turned out that they were saying something untrue that decreased the value to me of what I purchased from them.
This isn't something about sayig the 2014 is balanced or complete or anything like this. It's a statement of direction so we can properly gauge the value to us of the books coming out between now and then. They are saying it's "Just D&D" and they will keep the full value. It's understandable, when 5e was anounced 4e sales dried up. But if it ends up being a case of corporate greediness, and mechanics fromt hese books need to be reworked or just don't fit - then people have a right to yell.