No special cable or adapter required. However, you do still encounter the constant high speed fan issue after replacement. My understanding is that they built the fan sensor into the firmware of the Apple issued hard drives, so third party drives result in a null value being reported and thus the crazy fan noise. I'm curious how others are solving that problem.
Very simple and straight forward replacement. First-party SSD replacement can be found on ebay (typically removed from parted-out MacBook Airs). Currently they're aren't any third-party parts available.