I believe not, but check the latest FClient xml syntax for a ike version tag. I heard that fortinet was suppose to offer ikev2 in the forticlient, but when is the BIG question.
The opensource community from Strong/Openswan, raccoon and OpenIKEd has all support ikev2 for at least 8+ years now, it would be nice to see the FClient support and for the fortigate to have a Auto-IKE listener that supports either ikev1 or ikev2.