I believe (though I'm not 100% sure) that the plan is to get the hardcover edition of the collection out within a month or two of the release of #4, with the paperback edition to follow later in the year.
Cool. Thanks. I've been searching Amazon every few weeks just waiting to preorder it, and I've not seen it.
Hmm, just did a search and 3 are now showing up for release in August, November and December. They seem to be on the expensive side though.