$Summary says it all, apparently pam-kwallet supports kwallet5 upstream (somewhere?) now, would be nice to get this packaged and testable asap.
tosky helpfully mentioned in #fedora-kde irc: <tosky> rdieter: about the "where", see http://quickgit.kde.org/?p=kwallet.git&a=commit&h=aead424f00f91f141e8a14d0871ac97602242f11 <tosky> and subsequent commits
Here's a link to page explaining required changes: http://martys.typepad.com/blog/2015/07/kwallet5-can-be-auto-unlocked-during-login-again.html
pam-kwallet-5.4.1-1.fc23 sddm-0.12.0-2.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2015-15542
pam-kwallet-5.4.1-1.fc23, sddm-0.12.0-2.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update sddm pam-kwallet'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-15542
pam-kwallet-5.4.1-1.fc23, sddm-0.12.0-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.