We did an interview with Linode last month about some of their new upgrades: http://blog.serverbear.com/interview/linode/
You can also see some benchmark data from the new E5 CPU's here:
Dallas - http://serverbear.com/benchmark/2013/04/07/FxVC0fV6q5GAMa1j Fremont - http://serverbear.com/benchmark/2013/4/6/TX3w1Zx5dRK13MJi