Just wanted to quickly write down my opinion on the new server, and how I'd like it to be.
These are the features that I'd include:
4.75 PATCH: In this patch (including 4.7) there's lots of changes to maps, adding Akaron and Kaldor, so there's lots of more things to do. For example, there's Kaldor sieges, there's Beritra's Invasions, there's Pangea, there's Akaron Agents, Runatorium, lvl 65 Divine Fortress sieges, etc. Also, there's new enchanted sets (Runatorium, hyperion, etc), new craftable weapons, and the most important, the breakthrough system. This allows players to +20 their gear, making gear progression take a longer time, which i think that is good, but it shouldn't take players more than six months to fully max their gear.
BIG PVP EVENTS: Such as raid bosses, arena events, and all of that. I think that they will bring more people to the server, and having some people upload the fights in youtube and streaming would have a big impact in the population of the server. You have to encourage people to get PvP rewards by actually doing pvp, not just jumping in Pande and then selling temperings for 200kk.
GP RESETS: I'd do them every three months, although every two months is still good, to balance a bit the server. Since 4.75 has lots of other ways for you to obtain gp, you could even lower this to a month and a half or so. GP resets are a must for the server.
CONTROL RACE IMBALANCE: I think that this a must for a healthy server, you just can't have a 2:1, or 3:1 asmo-to-elyo ratio, just like we had some months before, and during the hole history of the server.
MAKE TEMPERINGS HARD TO GET: Make them drop at events, such as raid bosses or arenas, but only like 5-10% probability. Also, on these events, make people get Dragon King's Weapons, but at a double or so probability to drop than Temperings.
BM EXCHANGE: Probably like 600-800bm for DK's Weapon, and have some other rewards for BM.
I think that's all for me, I've thought about this a lot and spoke to some friends about it, and they have pretty much the same opinion as me, specially on the 4.75 patch thing. I know that you said that you weren't going to update it, but really, i think that it will make for a special server (since there's no other 4.75 server active and european).