I'm having a similar behavior when booting to the kdm login screen. During the boot messages, the prompt to enter the passphrase displays but the boot messages keep going. I just start entering the passphrase, ignoring any more boot messages, and when I hit enter at the end of the passphrase. It displays the 'health report' on the encrypted partition (/home) and finishes booting to the login screen like before. My boot times are no longer than before the change to systemd.
I'm on a dual boot system with Win7 and up to date SL on the weekly repository.
Be in perfect sync with the raging river and one will catch its prey