pembertron that's a great question!
Our upstream provider is phasing out their older Frankfurt data center and is slowly migrating all servers to a newer data center (modernized infrastructure, green power, etc). The DC details are available here.
So far they've not communicated a complete timeline for the entire migration, so I've asked them for that info. Once we've got all of the details we'll get the word out.
The remaining servers are:
We do have spare shared hosting capacity in the new data center right now, so if you're presently on any of those 4 servers and would like us to migrate your account at any time then please email our support team to arrange it. A single-account migration usually only has minutes of downtime or less.