More information from the Cisco AnyConnect team:
"As mentioned in the article, we can confirm that it is not possible for Cisco to provide the AnyConnect VPN functionality on Windows RT or Windows Phone at this time due to OS restrictions / API limitations. If you are interested in either of these platforms to be supported, we recommend that you reach out to your Microsoft sales team so that they can express interest on your behalf.
Best Regards,
Pete Davis
Cisco AnyConnect Product Team
******@cisco.com
@AnyConnect"
Bummer :(