Here's a better link with the merch that will be released on the 16th: http://disneyparksmerchandise.com/events/haunted-mansion-45th-anniversary-product-release-signing/.
It's mostly artwork, but there's a few new collectibles. Most notably (in my opinion) an official release of the plaque, for $95:
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I am curious about the dimensions of the plaque at $95. Good that they see the demand for it. I am interested in the busts. Wonder how big they will be?
-Eric