You guys betting on the Vertex 3 are going for a risky (for your data) gamble. There are three key components that must all be fully working that a SATA-3 can work:
1. The SSD must support it
2. The SATA Port of the controller in the computer must support it
3. The OS Driver must support it.
In the new MBP Pro, points 1+2 seem to be OK. Point 3 is not supported by Apple and it might not work correctly.
There are several threads for example in the crucial SSD forum that deal with flawed SATA-3 performance of the C300 on certain SATA-3 controllers.
So even if you have a top drive (Vertex-3) and spent top money on it, you could get a very bad surprise when hooking it up to the MBP Pro. Even if it works today, there is no guarantee that it continues to work speedy and flawless after the next Apple Software or Firmware upgrade or after the SSD's next firmware upgrade.
I rater have a well working SATA-2 SSD with low power consumption and high performance, than an unproven, unsupported, SATA-3 connection that might not give a reliable throughput under all load conditions.