Ultimately what this came down to for us is that the latest version of the ODT was not used when using the XML to deploy. The "SemiAnnualPreview" entry was too new for the version of ODT/setup.exe we were using to deploy.
<Add OfficeClientEdition="64" Channel="SemiAnnualPreview"> Does not install correct channel
Has anyone seen where the XML being used with the entry for SemiAnnualPreview is not working correctly? We have started seeing and issue where using the XML to deploy the Preview version. Initially when we first began deploying this entry in the XML did work and installed the correct version. Now though all of a sudden it is only installing the Semi Annual Channel and not the preview regardless of the line in the XML being <Add OfficeClientEdition="64" Channel="SemiAnnualPreview"> or <Add OfficeClientEdition="64" Channel="SemiAnnual">