With regard to the price:
There are some very clever people who have no doubt done some calculations with spreadsheets: "If we sell it at $40 we make $X per copy and can expect to sell Y copies; if we sell it at $50 we make $M per copy and can expect to sell N copies. X x Y is less than M x N, so $50 it is." (Note: I've vastly simplified this, of course.) They simply believe this will maximise their profits, and they're probably right.
The question we each have to ask is "is this game worth that amount
to me?"
To which my answer is a resounding "maybe".
On the one hand, it's $150 for an
upgrade of a game I already have four previous versions of (five if you count Pathfinder). I also have a big shelf containing lots of other RPGs, and I have four others on their way. I have more RPG material, and indeed more D&D material, than I would ever use even if I lived to 200.
On the other hand, I'm well aware that my edition of choice (3.5e) has some very serious, systematic flaws, at least some of which 5e seems to eliminate. There's a decent chance that I could enjoy running this edition significantly more than the previous ones.
And if this
does become my edition of choice, and if I continue to game with the same sort of frequency as at present, then across the likely-five-year life of the edition I'll get plenty of use from the books. Certainly, in terms of price vs usage, my 3.5e core rulebooks are probably my best purchases
ever.
So... I guess I'll wait and see. When the books come out, there will no doubt be a huge range of reviews. My intention is to seek out reviews by the people I generally trust, see what they say, and then make a decision. Which, to be fair, was pretty much what I was planning anyway - the $50 price hasn't changed that.