Well, looks like Lafferty's short story 'Land of the Great Horses' will at least get a fresh re-issue on the 'SF MASTERWORKS' series. Apparently Harlan Ellison's Dangerous Visions is set to become part of that series in 2012.
Now if they'd just go the rest of the way and release Lafferty's own short story collection Nine Hundred Grandmothers (and/or Past Master? Space Chantey? a whole new configuration of short stories?), then they'd finally have done their 'Masterworks' series some justice! (Seems like they've put out just about every other author out there! How can they leave out someone so critically acclaimed by his fellow s.f. writers?)
And while they're at it, they can put out Lafferty's novel Fourth Mansions on the Fantasy Masterworks series!