Until motherboards with powered eSATA show up, you'll have to use the Cobra's USB 2.0 port and that's probably around 3x slower than eSATA.
Pretec has dubbed this the Cobra eSATA/USB SSD and it will be available in both 32GB and 64GB sizes. While the drive is capable of 90MB/s read and 60MB/s write, its speed will be limited until it can be used via eSATA due to the current limits with USB 2.0. Pretec says that they are currently shipping the drive but haven't offered any information concerning the price of the SSD.
Source: TweakTown