Migration Paths from VMware v5 Certification to v6

Upgrading from VCP5 to VCP6: Only one exam is required. There is no course attendance required (but it is recommended). There will be five VCP6 migration options across the four technology tracks: Data Center Virtualization (DCV), Desktop and Mobility

Upgrading to VCIX6: For anyone certified as a VCAP5 one exam is required. There is no course attendance required (but it is recommended).

Upgrading to VCDX6: If you hold a VCDX5, you will only need to take the VCIX6 Design exam in the corresponding solution track.

More information can be found here