Welp, it's definitely on the new version of minecraft, but not all the plugins made the transition. Ironically the one I was most worried about, multiverse, seems to be fine. Portalling to other worlds seems to work fine, and looking at the server log, they've all apparently been converted.
Server seems kinda slow to me, though that could just be my work pc... and damn near all the other plugins from magic carpet to hawkeye are all busted. I think LWC and World Guard are working though, so we have fire suppression and chest protection.. but damn near nothing else is. I also see some doors n' such didn't quite make the transition facing the right direction and whatnot. PermissionsBukkit seems to be functioning.
Well, could be worse, I suppose.