Sorry for digging up this old thread, but since the Vertex 2 is finally announced (and I've already ordered it), it thought it would be nice to clear things up.
The Vertex 2 has SATA 3Gpbs interface, but no internal RAID. Speeds are 285/275 R/W, 4kb random write: 50 000 IOPS, SandForce controller.
The Vertex 2 Pro, will not have internal RAID either. That seems to be limited to the PCI-E devices and the Colossus series. However, I've seen e-tailers advertize the Vertex 2 Pro as having the new SATA 6Gbps interface. This is not confirmed, just a rumour, as the Vertex 2 Pro is still not officially announced by OCZ, only on the support forum by official: Tony.