Subject matter expertise has been applied to support a preliminary roadmapping exercise for the near-term implementation of thorium fuel cycles. Background presentations and a panel-facilitated discussion were used as mechanisms to identify and document key implementation challenges in the areas of resources, fuels, reactors, reprocessing/recycle, and safeguards. Participants identified the challenges which they believed should receive the greatest priority in terms of deploying thorium commercially. Reactor-related challenges were deemed to be the most important, followed by those related to reprocessing/recycle and fuels. Individual challenges that were deemed to merit a particularly high priority included fuel qualification, reactor code development and assessment, remote fuel fabrication, and reprocessing flowsheet optimization. These priorities build on those documented in other assessments.