Using logical fallacies to support your position isn't helping your case.
You know, I get tired of hearing this, so lets talk about it.
Absence of evidence
is evidence of absence. It's circumstantial evidence, not conclusive evidence, but it
is evidence. It's more or less the entire idea behind Occam's Razor. Absence of evidence isn't
proof of absence, but if you search far and wide and gather all the information you can and find no evidence of something, even in places where you would expect to find it, then yeah that's evidence that maybe what you're looking for isn't there after all. If this book had actual classes, you could reasonably expect that fact to be mentioned by developers when they discuss the book at conventions. You could reasonably expect the fact to be mentioned in the previews. You could reasonably expect the fact to be advertised on the cover. The fact that there's no evidence supporting the idea of full classes in this book in any of the places you would expect such evidence to appear
is evidence, if not proof, that there probably aren't full classes in this book, and the fact that pretty much all of the iconic shadow magic concepts have already been shoe-horned into builds that we already know about only supports that conclusion.
I am curious to see how they get around the fact that Necrotic damage is mechanically subpar at the best of times. I have my own houseruled solution, but I want to see how it balances against what, if anything, they come up with.
As am I. Necrotic is bad by default - a disadvantage for any power that uses it. It'll be hard to fix it. More or less, every build that focuses on its use needs to ignore resistance by default, or the powers just need to be stronger then other powers because they come with the necrotic drawback, and then on top of that there need to be feats and items that make it better, equivalent to those supporting cold, psychic, and radiant.
What I expect is that there will be a feat to ignore resistance and for that to be the sum total of support for necrotic. Which will mean it's still terrible, and those builds that rely on it subpar, as they have to burn a feat just to remove the drawback, where as characters using any other element could have spent that feat making their powers even better.
But who knows. My faith in WotC right now is about nil. They've gotten progressively better at 4e monster design, but everything else, from their digital support to their class design philosophies to the new treasure paradigm all has me looking forward to new releases less and less with every new product and preview I see.