I was thinking the same that having a dual camera set-up could be used for tracking. The wide angle is going to be so wide though, I don't think it will help to guide any more precisely when using the telephoto. You could probably use the telephoto to help guide the wide... but the wide is so wide that the mount is likely good enough without tracking...
All the same, I'm still excited about it!
I don’t expect ZWO to do anything so complicated as using either camera for guiding the other. I anticipate their tracking to use the same system and algorithms that they’ve been using all along. It works reasonably well, and it keeps costs low.