Our Linux OS of choice, CentOS, have just released version 7. See the announcement and the release notes for details.
For the first time, there will be a supported migration path from CentOS 6 to 7, so customers currently running on CentOS 6 will in future be able to upgrade to CentOS 7 with minimal work involved. Customers running CentOS 5 who wish to move to 7 will need to provision a new CentOS 7 VM and migrate their data as was the case with previous CentOS upgrades.
For any customers wishing to upgrade we will as always be happy to provide an additional VM running CentOS 7 which you can run in parallel to your existing VM(s) while you migrate your data for up to 30 days free of charge. Contact us for details.