TfsSourceNewName Property MSBuild Extension Pack Help 4.0.12.0
Used to resolve a name collision conflict. Can only be used in conjunction with AcceptMerge and AcceptYoursRenameTheirs. With AcceptMerge, /newname is only valid with conflicts that involve rename and/or undelete. If used, you must supply a new path.

Namespace: MSBuild.ExtensionPack.VisualStudio
Assembly: MSBuild.ExtensionPack (in MSBuild.ExtensionPack.dll) Version: 4.0.0.0
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Reference