I was wondering that too. This one came out over a year ago, you'd think one would at least show up for pre-order (or TBA) but maybe they are waiting for a certain number of issues to be released. Since this one had almost 50 and they're up into the 70s? Although personally with how heavy this one is I wouldn't mind it slightly smaller.
The trade paperbacks w 6 issues each are out roughly every 6 months. The hardcover compendium have 12 issues, which means one release per year. This compendium has the first 4 years worth of issues, and the comic magazine series is at # 78. Unless the publisher is feeling generous, you can expect another compendium in more than another year and a half at the earliest. Moreover, the publisher loses money by letting folks buy the compendium rather than 4 of the hardcovers, so they probably will not exactly be rushing it into print. Bottom line: compendium 1 is just the point of entry to the series, and if you like it enough to continue reading, you'll probably end up buying the continued series in less economical formats.