When are new servers opening?

This has been replied to in our FAQ:
Frequently Asked Questions (Jun 23rd 2009)

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Q u o t e:
Realms

Q: Are you planning on opening any new realms very soon?
A: Unless there's a sticky thread about it in the General forum or news about it on the website; no.

Q: When will you open new realms?
A: New realms are opened as other realms of the same type (PvE/Normal, PvP, RP, RP PvP) fill up. The goal is to always be able to have the Recommended tag on a given number of PvE/Normal and PvP realms, and avoid having all RP and RP PvP realms tagged as Full.

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It has also been address by Floris here:
http://forums.wow-europe.com/thread.html?topicId=285211438&sid=1