I intend to keep the plugin layout and configs largely intact. There may be a few more additions, but they are minor and won't be geared towards changing the gameplay.
For world setup, I'm thinking of adding a second main world to what we currently have, probably a large biomes one pre-generated on my system and uploaded.
So basically it'll be much like the current server, with a few tangential additions to the standard experience. No crazy mod downloading like on the TF2 server, no no.