From my experience you still should use a dmz guest anchor controller. The only difference is the ports you will need to open on the FW between the guest anchor and ISE. Now you can still do this without a guest anchor if there isn't an existing one or one not planned for.
There are few documentations if any. I know that there is a video on one of these mobility forums regarding setup for ISE. The only difference is the redirect that has to take place and the pre-auth acl's that you need to define on the WLC for webauth to work with ISE.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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