The (very) recently added ktorrent-3.2_rc1.ebuild has KDE_MINIMAL="4.22" rather than simply KDE_MINIMAL="4.2", so when you attempt to update to it, it fails with "emerge: there are no ebuilds to satisfy ">=kde-base/kdelibs-4.22[-kdeprefix]"."
Oh my dear shame on me! I changed it from 4.1 to 4.2 before commit. I guess i just hit the 2 twice :( Fixed in the tree. Thanks for report.