I've downloaded and installed 12.2(33)SXI on a WS-SUP720-10G with the objective of migrating to VTP3 in order to turn off VTP on a per-trunk basis.
The rest of the network runs 12.2(33)SXH on WS-SUP720-3B using VTP2. In testing mode, these are standalone supervisors.
The documentation states that all devices in a VTP domain must run the same VTP version. In contradiction to this, there is also a section explaining the interaction between VTP V3 and V2 devices. (http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vtp.html) I've set up VTP3 as the primary server, and configured a VTP domain and no password. On the switch running 12.2(33)SXH, I've configured it as a VTP client using V2 and configured the same VTP domain and no password. The client is not sending or receiving Configuration Revisions when a vlan is added to the domain throught the VTP 3 primary server. I set the vtp server to use VTP2, but the client is still not sending or receiving configuration revisions (the count is not incrementing.)