The upgrade to R65 seemed to go well. I opted to keep my settings. Following the upgrade, I was prompted to perform the "Factory Test for Touch Screen" as expected. I complete the test and I was left with:
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(Note: 2.4GHz is disabled). The device continued to function normally otherwise: web UI, WiFI, making changes (yay AP/bridge mode) etc; only the LCD is non-responsive. After about 20 minutes, I rebooted the router (via connect.securify.com). Upon reboot, I was prompted with the "Factory Test for Touch Screen" once again. I repeated this twice more.
Finally I decided to do a hard reset, it rebooted, I performed the test once more and finally then was greeted with the standard startup wizard.
So I'm back up and running, but I'm reporting this as a bug all the same.