We are still resolving timelines on moving the worlds to new tech but it is looking like we should be moved over in the next 2-3 months. I will give a better timeline once I have it.
5 US and 5 EU is correct. In our selection we will have one RP per region (EU & US) and one world per language (DE, FR and ENG).
I really think it would be better,if you remain one normal and one RP-Server per language at the EU-Cluster.