Below mentioned forums can be used for discussions/QnA about SharePoint 2013

SharePoint 2013 Preview for IT Professionals

Use this forum to ask questions and comment about SharePoint 2013 Preview as it pertains to setup, deployment, administration, and other IT Professional issues.

SharePoint 2013 Preview for Developers

Use this forum to ask questions and comment about SharePoint 2013 Preview as it pertains to development, customization, and other Developer issues.

Developing Apps for SharePoint

Use this forum to ask questions and comment about developing apps for SharePoint 2013.