As of now, all threads in excess of 20 pages will be locked and moved to the new Archive forum. A new thread, bearing the same name except for a II on the end, will be opened in the same forum as the old.
Example: 'Best Naval Fighter', in the Aviation Forum, will be locked and moved to the Archive Forum. A new thread in the Aviation forum will be created, bearing the name 'Best Naval Fighter II', and will retain the same post status (in this case, a sticky thread)
UPDATE:The last ten posts in a thread will begin the new thread for continuity