Surgeons in New York have successfully attached a kidney grown in a genetically altered pig to a human patient and found that the organ worked normally, a scientific breakthrough that one day may yield a vast new supply of organs for severely ill patients.
We should make clear that this was an experiment on a human patient who was already brain-dead and being kept alive artificially; there's no suggestion that we are ready to perform this sort of transplant on live patients.
But it's intriguing, and an advance, yes. I think pig heart valves have already been used in human transplants for decades, but the kidney is a new one.
As for whether this will be a viable option in the long-term, I'm not sure. Tissue engineering is a rapidly developing field, and it may be that we will be able to grow new organs (with zero chance of rejection) artificially in the near(ish) future. But I'm no expert; this is just uneducated speculation.