The new kde-base/kdebindings-meta-3.5.6 depends on kde-base/kalyptus-3.5.5 or kde-base/kalyptus-3.5.6 niether of which exist. kde-base/kalyptus-3.5.4 is the latest version. These are the packages that would be merged, in order: Calculating world dependencies emerge: there are no ebuilds to satisfy "~kde-base/kalyptus-3.5.6". (dependency required by "kde-base/kdebindings-meta-3.5.6" [ebuild])
Thanks for reporting, fixed.