We cap the number of customers on a box to the number of physical CPUs.
All new servers are 8+ CPU, Dedicated SSD, with the existing VPS servers being slowly replaced with dedicated.
The Locations of Closed servers are not closed. We do have multiple servers in the same location, see Dallas.
The first Drupal 8 site will be placed on a to be built, Dedicated SSD server,. You will get input on what general region that server is in. It will also most likely be a 12 CPU machine similar to Server 07.