I called up IDW and canceled my pre-order a month or so back. When I spoke to the CSR, I asked how limited this would be and if there was going to be a good chance I would totally lose out not getting in early (like had seemed to be the case with the Deluxe book last year)- she said she didn't think this was supposed to be 'extremely limited' and I should still have a good chance of getting one closer to Christmas.
At $100+ (tax and/or shipping) I don't expect these to be flying off the shelves- especially since this is more or less redundant material designed to appeal more to a completest or another artist.

As far as reviews, and until someone else chimes in with first hand thoughts, Harry Knowles of AICN supposedly got one a month or so back and was very impressed and complimentary.