First and foremost:
WELCOME BACK, DEREK!!!!!
I think the books may be a good idea assuming they clear up some of the confusion that has been addressed by errata. Also, I can easily see making the ranger and the monk easier to customize, perhaps with advice on how to customize classes in general. (For example, in some campaigns, a wizardly order may advise nobles and may have diplomacy as a class skill. Or there may be priests who oppose evil outsiders as most oppose undead. Or at least some creative advice on skills and feats and how to use them.) The advice on using monsters seems to be an added bonus. (Mass combat rules would be nice as well.)
RPGs, for the money, may be one of the most cost efficient forms of entertainment around. Consider the cost of a movie ($8-$10) compared with a $30 RPG book. If you game twice a month for four hours each, that is like seeing four movies at $8 to $10 each.
The key question is how will the books make the game more enjoyable? I admit that there were some things that were puzzling about 3rd Edition when it came out. Attacks of Opportunity alone could use some better examples.
I have played D&D since 1980 and have seen a great many changes. I am willing to give WoTC a chance. Do I expect perfection? Of course not. However, I hope that they give the new books their best effort.
The spikey armor art style really does not appeal to me that much, being a bit of a history buff. I would like to suggest a modest compromise: some of the spikey armor and some more traditional. Different looks can help to imply such things as different cultures and worlds. After all, there is no reason why a suit of armor of the same type should look exactly the same in different cultures, let around worlds. (That and I wonder what happens if someone in spikey armor falls hard on to a wooden floor. Might be time to cast that summon giant crow bar spell.

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