Scott,
If I can make a suggestion that (I hope) will be helpful...I think the problem people are having is with the way in which the products are being marketed.
Everyone seems to be saying "oh, this is just preview material that would normally be on the website, and they're charging for it," and this is making everyone dismiss the product out of hand.
What I think would have worked is to call the entire book a "visual guide to Dungeons and Dragons," and really not make any mention of the preview aspect at all. I have the visual guides to Lord of the Rings, Firefly, Serenity and many more, and they're all basically what these products are. The reason I think they're popular with the fans is precisely because they weren't marketed as a preview for anything, but rather as a "you want to know absolutely everything about X, well here's the guide for it!"
I don't know if there's anything that can really be said to change people's minds about these two books, but I'd like to hear what you have to say about them. What's in them that's cool and interesting and should make me want to buy them? What do I get with them that I won't simply get in June? I'm listening, and I'd like to hear about it. Frankly, at the moment I'm in the strange position of not buying anything from WotC for about eight months (until the launch of 4E)...that's a weird position to be in, so I'd frankly like to find something in these books that will make them appealing.
Just my concerns...
--Steve