I'm putting this here rather than the collaboration forum, because this is more of a management and process concern than is is strictly a collaboration topic.
According to Scott Shephard, Autodesk Design Review will no longer be updated or maintained. This seems like a hugely anti-customer move, to quote dgorsman, "C'thulhu-headed". While there's no imperative need for ADR to be released in synch with the annual Acad upgrade cycle, there is a strong need for a DWF view, review, comment, and markup tool that works with the current/future releases of AutoCAD and the DWF/DWFx format. Right now that's Autodesk Design Review, and AFAIK there's nothing equivalent available - certainly nothing that has the integration with AutoCAD.
If you use ADR, or distribute DWF files as deliverables, I'd suggest that you contact your reseller, and/or log a subscription support issue to object to this