Players on Antonia Bayle and Stormhold shouldn’t have too much to worry about in preparation for the merge; mail and bank inventories will both be transferred over with the merge, as will player housing, dungeons, and most other relevant item-storage facilities. The server-merge FAQ does note, however, that players should retrieve any soulbound items from shared housing (e.g. guild halls) to prevent losing ownership of said items. The FAQ also provides details on how issues regarding duplicate character and guild names will be handled following the merge, among other potential issues, so if you want more details on how this is going to pan out, you can check out the FAQ on the game’s official site.
Source: EverQuest II official site via Twitter. The original version of this article incorrectly identified Stormhold as the last remaining TLE server; our deepest apologies to Fallen Gate, which is still humming along.