Build the new image
New-OSBuild -Execute -CreateISO
Found your new ISO in C:\OSDBuilder\OSBuilds\GENERATEDBUILDNAME\ISO
You can Download new updates before the build by running
New-OSBuild -Download -Execute -CreateISO
If you have multiple tasks (not template tasks), you can select which task you want to run with:
New-OSBuild -ByTaskName "Unattend-Cube" -Download -Execute -CreateISO