At this point, podcast playlist syncing doesn't have a way to show only a subset of predetermined episodes, for this reason we will see some episodes, from before the synchronisation, that should be not shown in Amarok. This will be fixed as soon as we get some priorities done first, since that bug don't prevent usage.
This week, I will try to run a gpodder.net server, as suggested by our libmygpo-qt comrade, HorrusHorrendus, in order to make the next part of this project easier to test. I also plan to continue coding the existing skeleton of the plugin infrastructure for the gpodder integration with Amarok.
Lucas says he will have some more updates next week, so if you want to be up to date when Amarok's gpodder.net-related feature set exceeds that of gPodder, subscribe to his blog!