Lot of servers have partially implemented 3rd classes but its subjected to heavy customization. Renewal I suppose means complete integration of Renewal mechanics and 3rd classes corresponding to the latest kRO releases. I do know of just one server. They seem to have a very competent scripting staff although they are a new server presently.
aRO wont be getting Renewal or 3rd classes till eA developers put it inside eA and make it a default. I doubt eA will be getting complete renewal before 2012.
Renewal was the official servers way of saying "Goodbye Private servers, good game".