Some issues i think SDE/GMs/TNFs should have in mind. Posting them here for see if someone wants to add more. Maybe we highlight things they didn't consider:
Ships.
1-What are you going to do if the same person has the same premium ship/event ship in both servers?
2-What are you going to do if the same person has the same ship (no-premium) in both servers (this includes BB6/CV6s) ?
3-What are you going to do if the limit of ships you can have on harbor is inferior to the ships you have in both servers? (or the same problem can be presented in just 1 national harbor).
Credits/Points/Items
4-What are you going to do with the credits/points people have on both servers (i guess they will be merged too) ?
5-What are you going to do if credits/points limit adding the two accounts is overflowed ?
6-What are you going to do with the boosts/experts/vets/smoke/mines/elites/BO resets/ premium HHs ... items (i guess they will be merged too)?
7-What are going to do with things like HQ expansions or Harbor expansions, they will be merged too ?
Sailors
8-What are you going to do with sailors ( i guess the intention is too merging them all too) ?
9-What are you going to do if the number of sailors in shipyard from both servers is superior to the 50 sailors limit (i guess putting them on "black pages" of the HQ, but you know there is another "option") ?
10-What are you going if the amount of sailors surpases the limit of 50 sailors on shipyard +10 HQ pages (quite unlikely, but you need to consider it too)?
Other things:
What are you going to do with inactive accounts that are inactive since 1 year or more time (or slept accounts, banned accounts, similar things) they will be merged too like normal ones?
Fleets will be disbanded again?
Harbors owners will be reseted again?
What are you going to do with Rankings, they will be merged too ?
Would be able to do for you the elimination of lvl 1 yellow sailors for high level accounts on the "secondary" server for make it less confusing (i guess noone wants to keep them)?
Would be able to you to post some kind of recomendations/guidelines for players for avoiding possible issues with the merge of accounts (of course, when possible) ?
Would be able to you to let community to choose the name of the new server (if it's going to have a name) ?
Is there going to be some kind of changes in battle limits, new game types or fix some of current ones (we will have more people), change in the size of fleets, creating a general chat channel for all the server, changes in ranking system, or more important things like reestructuration on TNFs/GM team or other changes due to this merge?
Did you have in mind to change certain website zones where you can choose "server" (trade forums posting, ticket sending, rankings, etc ) ?
With the merging of the servers is finally the olive premium trade comming back ?
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I think making a good and complete review can make his job easier an minimize the number of future issues when they do it.
Any more issues you think they should look at?