Looks like IOS-XR would be available in a VM format soon, according to GNS:
Cisco's VIRL till hit the final version(s) (personal/enterprise) will need some time as it seems, but is a good start !!!
Actually is already available, guidelines at cisco support forums including link for download (requires cco account) :https://supportforums.cisco.com/docs/DOC-39939
How to use IOS-XRv in GNS3