I hope someone INVALID's this and lets me know I'm smoking something, but I attached a patch that makes the _beta1 stuff actually download. I'm not sure why alpha1 was ok and beta1 is giving crap now :(.
Created attachment 69045 [details, diff] kde-meta.patch Patch to kde-meta.eclass
alpha1 was already on mirrors because of the monolithic ebuilds, that's why it hasn't failed. Fixed in CVS.