Updated on Sept. 5th.
CC 3.1 has released last week, so this thread won't be maintained anymore. Please share you comment there, thank you!
https://forum.reallusion.com/420494/Whats-New-in-Character-Creator-31


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For this month, we will reveal some CC 3.1 features that are coming to you first as we prepare materials for CC v3.2 / v3.3 and the brand new Headshot plugin.

Character Creator 3.1 will be released the end of August.  As a 3D character creation hub, making good use of external and internal content assets is the key to help users create various characters. We adapted the editing tools in this version, so users can easily refine the external content for better use in terms of quality and performance.  The export capability to 3rd party tools including animation engines (e.g. iClone), and game engines (e.g. Unreal Engine, Unity) is enhanced in many ways, with remeshed iAvatar export, advanced customization settings on FBX export for different engines (e.g. Unreal hand and foot IK). 

As mentioned in the H2 Roadmap post, the CC3.1 updates can be categorized into four parts. 

• Seamless Content Conversion & Flexible Content Application
• Consolidate materials
• Weld vertices
• Cloth hide mesh tool
• New content format: AvatarPreset (updated; the best format to fast switch the whole character), iMaterialPlus, IES
• New Transformer profile: Poser HiveWire character, iClone G6 character
• Feasibility to Create Characters for iClone Animation with Visual and Performance Balance
• Remeshed iAvatar export
• iAvatar export with texture size settings on individual objects
  
• Game Pipeline Enhancement
• Enhanced FBX export options for Mesh, Motion, Mesh & Motion
• New material merge options for Game Base to keep good visual quality on eyelashes
• Custom features for Unreal Engine 4 and Unity
• Character Creator & iClone Auto Setup
• Compatibility: the auto-setup tools for UE4 and Unity will be officially compatible with Character Creator 3.1 and iClone 7.6
• Characters: automate the process of shader assignment, skeleton mapping, LOD deployment (CC3 only)
• Props: automate the process of shader assignment
• Mechanism of Update Notification:  once you update Character Creator to 3.1, and update iClone to 7.6 or any version above, an update notice will prompt upon program startup if there is a new release of the auto-setup tool.

*Items highlighted in yellow means that it's only available in the Pipeline edition. 
*Export features is not highlighted because it works with CC3 for iClone if there is 3DXchange installed.

We've selected some features for sneak preview.  Now, let's explore more!